31145451133 has 2 divisors, whose sum is σ = 31145451134. Its totient is φ = 31145451132.

The previous prime is 31145451119. The next prime is 31145451193. The reversal of 31145451133 is 33115454113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22252583929 + 8892867204 = 149173^2 + 94302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31145451133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31145451095 and 31145451104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31145451193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572725566 + 15572725567.

It is an arithmetic number, because the mean of its divisors is an integer number (15572725567).

Almost surely, 2^31145451133 is an apocalyptic number.

It is an amenable number.

31145451133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31145451133 is an equidigital number, since it uses as much as digits as its factorization.

31145451133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The spelling of 31145451133 in words is "thirty-one billion, one hundred forty-five million, four hundred fifty-one thousand, one hundred thirty-three".