1265253634 has 4 divisors (see below), whose sum is σ = 1897880454. Its totient is φ = 632626816.

The previous prime is 1265253617. The next prime is 1265253641. The reversal of 1265253634 is 4363525621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1214174025 + 51079609 = 34845^2 + 7147^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1265253593 and 1265253602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316313407 + ... + 316313410.

Almost surely, 2^1265253634 is an apocalyptic number.

1265253634 is a deficient number, since it is larger than the sum of its proper divisors (632626820).

1265253634 is an equidigital number, since it uses as much as digits as its factorization.

1265253634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632626819.

The product of its digits is 129600, while the sum is 37.

The square root of 1265253634 is about 35570.4039054942. The cubic root of 1265253634 is about 1081.5813693654.

The spelling of 1265253634 in words is "one billion, two hundred sixty-five million, two hundred fifty-three thousand, six hundred thirty-four".