1954881931 has 4 divisors (see below), whose sum is σ = 1955859912. Its totient is φ = 1953903952.

The previous prime is 1954881923. The next prime is 1954881949. The reversal of 1954881931 is 1391884591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1954881931 - 2³ = 1954881923 is a prime.

It is a super-2 number, since 2×1954881931² = 7643126728300577522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954881431) 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 3 ways as a sum of consecutive naturals, for example, 485986 + ... + 489991.

It is an arithmetic number, because the mean of its divisors is an integer number (488964978).

Almost surely, 2^1954881931 is an apocalyptic number.

1954881931 is a deficient number, since it is larger than the sum of its proper divisors (977981).

1954881931 is an equidigital number, since it uses as much as digits as its factorization.

1954881931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977980.

The product of its digits is 311040, while the sum is 49.

The square root of 1954881931 is about 44214.0467611821. The cubic root of 1954881931 is about 1250.3746996156.

The spelling of 1954881931 in words is "one billion, nine hundred fifty-four million, eight hundred eighty-one thousand, nine hundred thirty-one".