1265854913 has 2 divisors, whose sum is σ = 1265854914. Its totient is φ = 1265854912.

The previous prime is 1265854907. The next prime is 1265854937. The reversal of 1265854913 is 3194585621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1168477489 + 97377424 = 34183^2 + 9868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265854913 - 2⁴ = 1265854897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265854963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632927456 + 632927457.

It is an arithmetic number, because the mean of its divisors is an integer number (632927457).

Almost surely, 2^1265854913 is an apocalyptic number.

It is an amenable number.

1265854913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265854913 is an equidigital number, since it uses as much as digits as its factorization.

1265854913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 44.

The square root of 1265854913 is about 35578.8548579068. The cubic root of 1265854913 is about 1081.7526734043.

The spelling of 1265854913 in words is "one billion, two hundred sixty-five million, eight hundred fifty-four thousand, nine hundred thirteen".