31121007 has 8 divisors (see below), whose sum is σ = 41526576. Its totient is φ = 20731392.

The previous prime is 31120997. The next prime is 31121021. The reversal of 31121007 is 70012113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31121007 - 2⁸ = 31120751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1743 + ... + 8079.

It is an arithmetic number, because the mean of its divisors is an integer number (5190822).

Almost surely, 2^31121007 is an apocalyptic number.

31121007 is a deficient number, since it is larger than the sum of its proper divisors (10405569).

31121007 is a wasteful number, since it uses less digits than its factorization.

31121007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7977.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 31121007 is about 5578.6205284102. The cubic root of 31121007 is about 314.5462754685.

The spelling of 31121007 in words is "thirty-one million, one hundred twenty-one thousand, seven".