1955261961 has 6 divisors (see below), whose sum is σ = 2824267290. Its totient is φ = 1303507968.

The previous prime is 1955261941. The next prime is 1955261989. The reversal of 1955261961 is 1691625591.

It is a happy number.

1955261961 is a `hidden beast` number, since 1 + 9 + 552 + 6 + 1 + 96 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1697852025 + 257409936 = 41205^2 + 16044^2 .

It is not a de Polignac number, because 1955261961 - 2⁹ = 1955261449 is a prime.

It is a super-2 number, since 2×1955261961² = 7646098672267131042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1955261941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108625656 + ... + 108625673.

It is an arithmetic number, because the mean of its divisors is an integer number (470711215).

Almost surely, 2^1955261961 is an apocalyptic number.

It is an amenable number.

1955261961 is a deficient number, since it is larger than the sum of its proper divisors (869005329).

1955261961 is a wasteful number, since it uses less digits than its factorization.

1955261961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217251335 (or 217251332 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 1955261961 is about 44218.3441684557. The cubic root of 1955261961 is about 1250.4557188494.

The spelling of 1955261961 in words is "one billion, nine hundred fifty-five million, two hundred sixty-one thousand, nine hundred sixty-one".