1265749057 has 4 divisors (see below), whose sum is σ = 1292679936. Its totient is φ = 1238818180.

The previous prime is 1265749039. The next prime is 1265749063. The reversal of 1265749057 is 7509475621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1265749057 - 2¹¹ = 1265747009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1265748998 and 1265749016.

It is not an unprimeable number, because it can be changed into a prime (1265749097) 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, 13465369 + ... + 13465462.

It is an arithmetic number, because the mean of its divisors is an integer number (323169984).

Almost surely, 2^1265749057 is an apocalyptic number.

It is an amenable number.

1265749057 is a deficient number, since it is larger than the sum of its proper divisors (26930879).

1265749057 is an equidigital number, since it uses as much as digits as its factorization.

1265749057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26930878.

The product of its (nonzero) digits is 529200, while the sum is 46.

The square root of 1265749057 is about 35577.3672016354. The cubic root of 1265749057 is about 1081.7225190262.

The spelling of 1265749057 in words is "one billion, two hundred sixty-five million, seven hundred forty-nine thousand, fifty-seven".