31131042321 has 8 divisors (see below), whose sum is σ = 42291227520. Its totient is φ = 20362442672.

The previous prime is 31131042281. The next prime is 31131042323. The reversal of 31131042321 is 12324013113.

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

It is a cyclic number.

It is not a de Polignac number, because 31131042321 - 2¹⁹ = 31130518033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31131042323) 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, 97896201 + ... + 97896518.

It is an arithmetic number, because the mean of its divisors is an integer number (5286403440).

Almost surely, 2^31131042321 is an apocalyptic number.

It is an amenable number.

31131042321 is a deficient number, since it is larger than the sum of its proper divisors (11160185199).

31131042321 is a wasteful number, since it uses less digits than its factorization.

31131042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195792775.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31131042321 its reverse (12324013113), we get a palindrome (43455055434).

The spelling of 31131042321 in words is "thirty-one billion, one hundred thirty-one million, forty-two thousand, three hundred twenty-one".