31002121133 has 2 divisors, whose sum is σ = 31002121134. Its totient is φ = 31002121132.

The previous prime is 31002121109. The next prime is 31002121193. The reversal of 31002121133 is 33112120013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19904130724 + 11097990409 = 141082^2 + 105347^2 .

It is a cyclic number.

It is not a de Polignac number, because 31002121133 - 2⁶ = 31002121069 is a prime.

It is a super-2 number, since 2×31002121133² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31002121193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15501060566 + 15501060567.

It is an arithmetic number, because the mean of its divisors is an integer number (15501060567).

Almost surely, 2^31002121133 is an apocalyptic number.

It is an amenable number.

31002121133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31002121133 is an equidigital number, since it uses as much as digits as its factorization.

31002121133 is an evil number, because the sum of its binary digits is even.

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

Adding to 31002121133 its reverse (33112120013), we get a palindrome (64114241146).

The spelling of 31002121133 in words is "thirty-one billion, two million, one hundred twenty-one thousand, one hundred thirty-three".