31020130312 has 8 divisors (see below), whose sum is σ = 58162744350. Its totient is φ = 15510065152.

The previous prime is 31020130289. The next prime is 31020130313. The reversal of 31020130312 is 21303102013.

It can be written as a sum of positive squares in only one way, i.e., 19629691236 + 11390439076 = 140106^2 + 106726^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31020130312² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31020130313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1938758137 + ... + 1938758152.

Almost surely, 2^31020130312 is an apocalyptic number.

It is an amenable number.

31020130312 is a deficient number, since it is larger than the sum of its proper divisors (27142614038).

31020130312 is a wasteful number, since it uses less digits than its factorization.

31020130312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877516295 (or 3877516291 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31020130312 its reverse (21303102013), we get a palindrome (52323232325).

The spelling of 31020130312 in words is "thirty-one billion, twenty million, one hundred thirty thousand, three hundred twelve".