20154663131 has 2 divisors, whose sum is σ = 20154663132. Its totient is φ = 20154663130.

The previous prime is 20154663127. The next prime is 20154663149. The reversal of 20154663131 is 13136645102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20154663131 - 2² = 20154663127 is a prime.

It is a super-2 number, since 2×20154663131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20154663181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077331565 + 10077331566.

It is an arithmetic number, because the mean of its divisors is an integer number (10077331566).

Almost surely, 2^20154663131 is an apocalyptic number.

20154663131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20154663131 is an equidigital number, since it uses as much as digits as its factorization.

20154663131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 20154663131 in words is "twenty billion, one hundred fifty-four million, six hundred sixty-three thousand, one hundred thirty-one".