1265237217 has 12 divisors (see below), whose sum is σ = 1830772944. Its totient is φ = 842010840.

The previous prime is 1265237213. The next prime is 1265237231. The reversal of 1265237217 is 7127325621.

1265237217 is a `hidden beast` number, since 126 + 523 + 7 + 2 + 1 + 7 = 666.

It is not a de Polignac number, because 1265237217 - 2² = 1265237213 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1265237213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117963 + ... + 128240.

It is an arithmetic number, because the mean of its divisors is an integer number (152564412).

Almost surely, 2^1265237217 is an apocalyptic number.

It is an amenable number.

1265237217 is a deficient number, since it is larger than the sum of its proper divisors (565535727).

1265237217 is a wasteful number, since it uses less digits than its factorization.

1265237217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246780 (or 246777 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 1265237217 is about 35570.1731370540. The cubic root of 1265237217 is about 1081.5766914105.

The spelling of 1265237217 in words is "one billion, two hundred sixty-five million, two hundred thirty-seven thousand, two hundred seventeen".