31302132231 has 16 divisors (see below), whose sum is σ = 43090403328. Its totient is φ = 20191221600.

The previous prime is 31302132193. The next prime is 31302132263. The reversal of 31302132231 is 13223120313.

It is not a de Polignac number, because 31302132231 - 2¹⁵ = 31302099463 is a prime.

It is a super-2 number, since 2×31302132231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31302132198 and 31302132207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302132731) 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, 534541 + ... + 590201.

It is an arithmetic number, because the mean of its divisors is an integer number (2693150208).

Almost surely, 2^31302132231 is an apocalyptic number.

31302132231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31302132231 is a deficient number, since it is larger than the sum of its proper divisors (11788271097).

31302132231 is a wasteful number, since it uses less digits than its factorization.

31302132231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61742.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31302132231 its reverse (13223120313), we get a palindrome (44525252544).

The spelling of 31302132231 in words is "thirty-one billion, three hundred two million, one hundred thirty-two thousand, two hundred thirty-one".