1264540831 has 2 divisors, whose sum is σ = 1264540832. Its totient is φ = 1264540830.

The previous prime is 1264540829. The next prime is 1264540847. The reversal of 1264540831 is 1380454621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1264540831 - 2¹ = 1264540829 is a prime.

It is a super-2 number, since 2×1264540831² = 3198127026532341122, which contains 22 as substring.

Together with 1264540829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264540811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632270415 + 632270416.

It is an arithmetic number, because the mean of its divisors is an integer number (632270416).

Almost surely, 2^1264540831 is an apocalyptic number.

1264540831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264540831 is an equidigital number, since it uses as much as digits as its factorization.

1264540831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1264540831 is about 35560.3828860152. The cubic root of 1264540831 is about 1081.3782218840.

The spelling of 1264540831 in words is "one billion, two hundred sixty-four million, five hundred forty thousand, eight hundred thirty-one".