1540664231 has 2 divisors, whose sum is σ = 1540664232. Its totient is φ = 1540664230.

The previous prime is 1540664173. The next prime is 1540664233. The reversal of 1540664231 is 1324660451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1540664231 - 2²⁶ = 1473555367 is a prime.

It is a super-2 number, since 2×1540664231² = 4747292545365642722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1540664233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540664233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770332115 + 770332116.

It is an arithmetic number, because the mean of its divisors is an integer number (770332116).

Almost surely, 2^1540664231 is an apocalyptic number.

1540664231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540664231 is an equidigital number, since it uses as much as digits as its factorization.

1540664231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1540664231 is about 39251.2959149122. The cubic root of 1540664231 is about 1154.9663554726.

The spelling of 1540664231 in words is "one billion, five hundred forty million, six hundred sixty-four thousand, two hundred thirty-one".