20133131 has 2 divisors, whose sum is σ = 20133132. Its totient is φ = 20133130.

The previous prime is 20133107. The next prime is 20133137. The reversal of 20133131 is 13133102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20133131 is a prime.

It is a super-2 number, since 2×20133131² = 810685927726322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20133137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066565 + 10066566.

It is an arithmetic number, because the mean of its divisors is an integer number (10066566).

Almost surely, 2^20133131 is an apocalyptic number.

20133131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133131 is an equidigital number, since it uses as much as digits as its factorization.

20133131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 20133131 is about 4486.9957655429. The cubic root of 20133131 is about 272.0427187446.

Adding to 20133131 its reverse (13133102), we get a palindrome (33266233).

The spelling of 20133131 in words is "twenty million, one hundred thirty-three thousand, one hundred thirty-one".