1311372645 has 32 divisors (see below), whose sum is σ = 2327754240. Its totient is φ = 625035840.

The previous prime is 1311372641. The next prime is 1311372701. The reversal of 1311372645 is 5462731131.

It is not a de Polignac number, because 1311372645 - 2² = 1311372641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311372641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57619 + ... + 77088.

It is an arithmetic number, because the mean of its divisors is an integer number (72742320).

Almost surely, 2^1311372645 is an apocalyptic number.

1311372645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311372645 is a deficient number, since it is larger than the sum of its proper divisors (1016381595).

1311372645 is a wasteful number, since it uses less digits than its factorization.

1311372645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134785.

The product of its digits is 15120, while the sum is 33.

The square root of 1311372645 is about 36212.8795458191. The cubic root of 1311372645 is about 1094.5662175385.

It can be divided in two parts, 13113 and 72645, that added together give a palindrome (85758).

The spelling of 1311372645 in words is "one billion, three hundred eleven million, three hundred seventy-two thousand, six hundred forty-five".