1264137877 has 4 divisors (see below), whose sum is σ = 1265377036. Its totient is φ = 1262898720.

The previous prime is 1264137839. The next prime is 1264137881. The reversal of 1264137877 is 7787314621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7787314621 = 59243 ⋅131447.

It can be written as a sum of positive squares in 2 ways, for example, as 997991281 + 266146596 = 31591^2 + 16314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264137877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264138877) 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, 618048 + ... + 620089.

It is an arithmetic number, because the mean of its divisors is an integer number (316344259).

Almost surely, 2^1264137877 is an apocalyptic number.

It is an amenable number.

1264137877 is a deficient number, since it is larger than the sum of its proper divisors (1239159).

1264137877 is a wasteful number, since it uses less digits than its factorization.

1264137877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239158.

The product of its digits is 395136, while the sum is 46.

The square root of 1264137877 is about 35554.7166631939. The cubic root of 1264137877 is about 1081.2633469924.

The spelling of 1264137877 in words is "one billion, two hundred sixty-four million, one hundred thirty-seven thousand, eight hundred seventy-seven".