31030213199981 has 16 divisors (see below), whose sum is σ = 32667122292480. Its totient is φ = 29417304618240.

The previous prime is 31030213199977. The next prime is 31030213200017. The reversal of 31030213199981 is 18999131203013.

It is a cyclic number.

It is not a de Polignac number, because 31030213199981 - 2² = 31030213199977 is a prime.

It is a super-2 number, since 2×31030213199981² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030213199941) 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, 73703051 + ... + 74122871.

It is an arithmetic number, because the mean of its divisors is an integer number (2041695143280).

Almost surely, 2^{31030213199981} is an apocalyptic number.

It is an amenable number.

31030213199981 is a deficient number, since it is larger than the sum of its proper divisors (1636909092499).

31030213199981 is a wasteful number, since it uses less digits than its factorization.

31030213199981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448396.

The product of its (nonzero) digits is 314928, while the sum is 50.

The spelling of 31030213199981 in words is "thirty-one trillion, thirty billion, two hundred thirteen million, one hundred ninety-nine thousand, nine hundred eighty-one".