31005008312 has 8 divisors (see below), whose sum is σ = 58134390600. Its totient is φ = 15502504152.

The previous prime is 31005008303. The next prime is 31005008339. The reversal of 31005008312 is 21380050013.

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

It is a super-2 number, since 2×31005008312² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1937813012 + ... + 1937813027.

It is an arithmetic number, because the mean of its divisors is an integer number (7266798825).

Almost surely, 2^31005008312 is an apocalyptic number.

It is an amenable number.

31005008312 is a deficient number, since it is larger than the sum of its proper divisors (27129382288).

31005008312 is a wasteful number, since it uses less digits than its factorization.

31005008312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875626045 (or 3875626041 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 31005008312 its reverse (21380050013), we get a palindrome (52385058325).

The spelling of 31005008312 in words is "thirty-one billion, five million, eight thousand, three hundred twelve".