20131499 has 2 divisors, whose sum is σ = 20131500. Its totient is φ = 20131498.

The previous prime is 20131487. The next prime is 20131513. The reversal of 20131499 is 99413102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20131499 - 2¹⁶ = 20065963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20131399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065749 + 10065750.

It is an arithmetic number, because the mean of its divisors is an integer number (10065750).

Almost surely, 2^20131499 is an apocalyptic number.

20131499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131499 is an equidigital number, since it uses as much as digits as its factorization.

20131499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20131499 is about 4486.8139029828. The cubic root of 20131499 is about 272.0353679139.

The spelling of 20131499 in words is "twenty million, one hundred thirty-one thousand, four hundred ninety-nine".