1264156361 has 16 divisors (see below), whose sum is σ = 1386739200. Its totient is φ = 1145259648.

The previous prime is 1264156351. The next prime is 1264156511. The reversal of 1264156361 is 1636514621.

It is not a de Polignac number, because 1264156361 - 2⁶ = 1264156297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264156301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717800 + ... + 719558.

It is an arithmetic number, because the mean of its divisors is an integer number (86671200).

Almost surely, 2^1264156361 is an apocalyptic number.

It is an amenable number.

1264156361 is a deficient number, since it is larger than the sum of its proper divisors (122582839).

1264156361 is a wasteful number, since it uses less digits than its factorization.

1264156361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768.

The product of its digits is 25920, while the sum is 35.

The square root of 1264156361 is about 35554.9765996267. The cubic root of 1264156361 is about 1081.2686169804.

The spelling of 1264156361 in words is "one billion, two hundred sixty-four million, one hundred fifty-six thousand, three hundred sixty-one".