131011399 has 2 divisors, whose sum is σ = 131011400. Its totient is φ = 131011398.

The previous prime is 131011393. The next prime is 131011457. The reversal of 131011399 is 993110131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131011399 - 2⁷ = 131011271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131011393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65505699 + 65505700.

It is an arithmetic number, because the mean of its divisors is an integer number (65505700).

Almost surely, 2^131011399 is an apocalyptic number.

131011399 is a deficient number, since it is larger than the sum of its proper divisors (1).

131011399 is an equidigital number, since it uses as much as digits as its factorization.

131011399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 131011399 is about 11446.0210990545. The cubic root of 131011399 is about 507.8900383546.

The spelling of 131011399 in words is "one hundred thirty-one million, eleven thousand, three hundred ninety-nine".