1265106131 has 4 divisors (see below), whose sum is σ = 1288976112. Its totient is φ = 1241236152.

The previous prime is 1265106091. The next prime is 1265106173. The reversal of 1265106131 is 1316015621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1316015621 = 29 ⋅45379849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265106131 is a prime.

It is a super-2 number, since 2×1265106131² = 3200987045387578322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1265106131.

It is not an unprimeable number, because it can be changed into a prime (1265106631) 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, 11934911 + ... + 11935016.

It is an arithmetic number, because the mean of its divisors is an integer number (322244028).

Almost surely, 2^1265106131 is an apocalyptic number.

1265106131 is a deficient number, since it is larger than the sum of its proper divisors (23869981).

1265106131 is an equidigital number, since it uses as much as digits as its factorization.

1265106131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23869980.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1265106131 is about 35568.3304499944. The cubic root of 1265106131 is about 1081.5393375565.

The spelling of 1265106131 in words is "one billion, two hundred sixty-five million, one hundred six thousand, one hundred thirty-one".