31200030131 has 4 divisors (see below), whose sum is σ = 32842137000. Its totient is φ = 29557923264.

The previous prime is 31200030107. The next prime is 31200030133. The reversal of 31200030131 is 13103000213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200030131 is a prime.

It is a super-2 number, since 2×31200030131² (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 (31200030133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821053406 + ... + 821053443.

It is an arithmetic number, because the mean of its divisors is an integer number (8210534250).

Almost surely, 2^31200030131 is an apocalyptic number.

31200030131 is a deficient number, since it is larger than the sum of its proper divisors (1642106869).

31200030131 is a wasteful number, since it uses less digits than its factorization.

31200030131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642106868.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31200030131 its reverse (13103000213), we get a palindrome (44303030344).

The spelling of 31200030131 in words is "thirty-one billion, two hundred million, thirty thousand, one hundred thirty-one".