1305431031551 has 12 divisors (see below), whose sum is σ = 1364997740232. Its totient is φ = 1248361048176.

The previous prime is 1305431031529. The next prime is 1305431031587. The reversal of 1305431031551 is 1551301345031.

It is a de Polignac number, because none of the positive numbers 2^k-1305431031551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305431031251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1823885 + ... + 2436681.

It is an arithmetic number, because the mean of its divisors is an integer number (113749811686).

Almost surely, 2^{1305431031551} is an apocalyptic number.

1305431031551 is a deficient number, since it is larger than the sum of its proper divisors (59566708681).

1305431031551 is an equidigital number, since it uses as much as digits as its factorization.

1305431031551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616870 (or 616847 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

Adding to 1305431031551 its reverse (1551301345031), we get a palindrome (2856732376582).

The spelling of 1305431031551 in words is "one trillion, three hundred five billion, four hundred thirty-one million, thirty-one thousand, five hundred fifty-one".