31200213131 has 4 divisors (see below), whose sum is σ = 31202122032. Its totient is φ = 31198304232.

The previous prime is 31200213127. The next prime is 31200213137. The reversal of 31200213131 is 13131200213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31200213131 - 2² = 31200213127 is a prime.

It is a super-2 number, since 2×31200213131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31200213137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929720 + ... + 962693.

It is an arithmetic number, because the mean of its divisors is an integer number (7800530508).

Almost surely, 2^31200213131 is an apocalyptic number.

31200213131 is a deficient number, since it is larger than the sum of its proper divisors (1908901).

31200213131 is a wasteful number, since it uses less digits than its factorization.

31200213131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908900.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31200213131 its reverse (13131200213), we get a palindrome (44331413344).

The spelling of 31200213131 in words is "thirty-one billion, two hundred million, two hundred thirteen thousand, one hundred thirty-one".