1265441631 has 16 divisors (see below), whose sum is σ = 1792883808. Its totient is φ = 791168000.

The previous prime is 1265441603. The next prime is 1265441657. The reversal of 1265441631 is 1361445621.

It is a cyclic number.

It is not a de Polignac number, because 1265441631 - 2⁷ = 1265441503 is a prime.

It is a super-2 number, since 2×1265441631² = 3202685042935880322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1265441592 and 1265441601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265441131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29820 + ... + 58481.

It is an arithmetic number, because the mean of its divisors is an integer number (112055238).

Almost surely, 2^1265441631 is an apocalyptic number.

1265441631 is a deficient number, since it is larger than the sum of its proper divisors (527442177).

1265441631 is a wasteful number, since it uses less digits than its factorization.

1265441631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88602.

The product of its digits is 17280, while the sum is 33.

The square root of 1265441631 is about 35573.0464115740. The cubic root of 1265441631 is about 1081.6349354323.

It can be divided in two parts, 12654 and 41631, that added together give a triangular number (54285 = T₃₂₉).

The spelling of 1265441631 in words is "one billion, two hundred sixty-five million, four hundred forty-one thousand, six hundred thirty-one".