1264400651 has 4 divisors (see below), whose sum is σ = 1264876704. Its totient is φ = 1263924600.

The previous prime is 1264400647. The next prime is 1264400663. The reversal of 1264400651 is 1560044621.

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 1264400651 - 2² = 1264400647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264400351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234020 + ... + 239361.

It is an arithmetic number, because the mean of its divisors is an integer number (316219176).

Almost surely, 2^1264400651 is an apocalyptic number.

1264400651 is a deficient number, since it is larger than the sum of its proper divisors (476053).

1264400651 is an equidigital number, since it uses as much as digits as its factorization.

1264400651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476052.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1264400651 is about 35558.4118177401. The cubic root of 1264400651 is about 1081.3382618718.

The spelling of 1264400651 in words is "one billion, two hundred sixty-four million, four hundred thousand, six hundred fifty-one".