31506730407 has 16 divisors (see below), whose sum is σ = 46682272000. Its totient is φ = 21001951512.

The previous prime is 31506730351. The next prime is 31506730441. The reversal of 31506730407 is 70403760513.

It is not a de Polignac number, because 31506730407 - 2¹⁸ = 31506468263 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 (31506730477) 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, 172644 + ... + 304662.

It is an arithmetic number, because the mean of its divisors is an integer number (2917642000).

Almost surely, 2^31506730407 is an apocalyptic number.

31506730407 is a deficient number, since it is larger than the sum of its proper divisors (15175541593).

31506730407 is a wasteful number, since it uses less digits than its factorization.

31506730407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140867 (or 140861 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The spelling of 31506730407 in words is "thirty-one billion, five hundred six million, seven hundred thirty thousand, four hundred seven".