2154681931 has 2 divisors, whose sum is σ = 2154681932. Its totient is φ = 2154681930.

The previous prime is 2154681917. The next prime is 2154681937. The reversal of 2154681931 is 1391864512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2154681931 - 2⁵ = 2154681899 is a prime.

It is a super-2 number, since 2×2154681931² = 9285308447555777522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2154681937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077340965 + 1077340966.

It is an arithmetic number, because the mean of its divisors is an integer number (1077340966).

Almost surely, 2^2154681931 is an apocalyptic number.

2154681931 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154681931 is an equidigital number, since it uses as much as digits as its factorization.

2154681931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 2154681931 is about 46418.5515823146. The cubic root of 2154681931 is about 1291.5990688139.

The spelling of 2154681931 in words is "two billion, one hundred fifty-four million, six hundred eighty-one thousand, nine hundred thirty-one".