31431123312465 has 16 divisors (see below), whose sum is σ = 50290123981248. Its totient is φ = 16763156872896.

The previous prime is 31431123312443. The next prime is 31431123312481. The reversal of 31431123312465 is 56421332113413.

It is not a de Polignac number, because 31431123312465 - 2¹¹ = 31431123310417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4392154 + ... + 9063843.

It is an arithmetic number, because the mean of its divisors is an integer number (3143132748828).

Almost surely, 2^{31431123312465} is an apocalyptic number.

It is an amenable number.

31431123312465 is a deficient number, since it is larger than the sum of its proper divisors (18859000668783).

31431123312465 is a wasteful number, since it uses less digits than its factorization.

31431123312465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13611728.

The product of its digits is 155520, while the sum is 39.

Adding to 31431123312465 its reverse (56421332113413), we get a palindrome (87852455425878).

The spelling of 31431123312465 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred twenty-three million, three hundred twelve thousand, four hundred sixty-five".