1955597281 has 12 divisors (see below), whose sum is σ = 2223666900. Its totient is φ = 1716508640.

The previous prime is 1955597251. The next prime is 1955597311. The reversal of 1955597281 is 1827955591.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1955597251) and next prime (1955597311).

It can be written as a sum of positive squares in 2 ways, for example, as 1293049681 + 662547600 = 35959^2 + 25740^2 .

It is not a de Polignac number, because 1955597281 - 2⁷ = 1955597153 is a prime.

It is a super-2 number, since 2×1955597281² = 7648721450909185922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1955597251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275146 + ... + 282163.

It is an arithmetic number, because the mean of its divisors is an integer number (185305575).

Almost surely, 2^1955597281 is an apocalyptic number.

1955597281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1955597281 is a deficient number, since it is larger than the sum of its proper divisors (268069619).

1955597281 is a wasteful number, since it uses less digits than its factorization.

1955597281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557360 (or 557349 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 52.

The square root of 1955597281 is about 44222.1356449460. The cubic root of 1955597281 is about 1250.5271975656.

The spelling of 1955597281 in words is "one billion, nine hundred fifty-five million, five hundred ninety-seven thousand, two hundred eighty-one".