99471391 has 2 divisors, whose sum is σ = 99471392. Its totient is φ = 99471390.

The previous prime is 99471347. The next prime is 99471397. The reversal of 99471391 is 19317499.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99471391 - 2⁷ = 99471263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99471397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49735695 + 49735696.

It is an arithmetic number, because the mean of its divisors is an integer number (49735696).

Almost surely, 2^99471391 is an apocalyptic number.

99471391 is a deficient number, since it is larger than the sum of its proper divisors (1).

99471391 is an equidigital number, since it uses as much as digits as its factorization.

99471391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 99471391 is about 9973.5345289421. The cubic root of 99471391 is about 463.3395761398.

The spelling of 99471391 in words is "ninety-nine million, four hundred seventy-one thousand, three hundred ninety-one".