31431122340465 has 16 divisors (see below), whose sum is σ = 50453606161728. Its totient is φ = 16708661775936.

The previous prime is 31431122340461. The next prime is 31431122340523. The reversal of 31431122340465 is 56404322113413.

It is not a de Polignac number, because 31431122340465 - 2² = 31431122340461 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31431122340461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3412712262 + ... + 3412721471.

It is an arithmetic number, because the mean of its divisors is an integer number (3153350385108).

Almost surely, 2^{31431122340465} is an apocalyptic number.

It is an amenable number.

31431122340465 is a deficient number, since it is larger than the sum of its proper divisors (19022483821263).

31431122340465 is a wasteful number, since it uses less digits than its factorization.

31431122340465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6825434048.

The product of its (nonzero) digits is 207360, while the sum is 39.

Adding to 31431122340465 its reverse (56404322113413), we get a palindrome (87835444453878).

The spelling of 31431122340465 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred twenty-two million, three hundred forty thousand, four hundred sixty-five".