1265297534 has 4 divisors (see below), whose sum is σ = 1897946304. Its totient is φ = 632648766.

The previous prime is 1265297531. The next prime is 1265297543. The reversal of 1265297534 is 4357925621.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265297531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316324382 + ... + 316324385.

It is an arithmetic number, because the mean of its divisors is an integer number (474486576).

Almost surely, 2^1265297534 is an apocalyptic number.

1265297534 is a deficient number, since it is larger than the sum of its proper divisors (632648770).

1265297534 is an equidigital number, since it uses as much as digits as its factorization.

1265297534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632648769.

The product of its digits is 453600, while the sum is 44.

The square root of 1265297534 is about 35571.0209861904. The cubic root of 1265297534 is about 1081.5938782863.

The spelling of 1265297534 in words is "one billion, two hundred sixty-five million, two hundred ninety-seven thousand, five hundred thirty-four".