31045321531 has 8 divisors (see below), whose sum is σ = 35481528800. Its totient is φ = 26609404608.

The previous prime is 31045321523. The next prime is 31045321583. The reversal of 31045321531 is 13512354013.

It is a happy number.

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 31045321531 - 2³ = 31045321523 is a prime.

It is a super-2 number, since 2×31045321531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31045321531.

It is not an unprimeable number, because it can be changed into a prime (31045321591) 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, 255295 + ... + 356743.

It is an arithmetic number, because the mean of its divisors is an integer number (4435191100).

Almost surely, 2^31045321531 is an apocalyptic number.

31045321531 is a deficient number, since it is larger than the sum of its proper divisors (4436207269).

31045321531 is a wasteful number, since it uses less digits than its factorization.

31045321531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145173.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 31045321531 its reverse (13512354013), we get a palindrome (44557675544).

The spelling of 31045321531 in words is "thirty-one billion, forty-five million, three hundred twenty-one thousand, five hundred thirty-one".