99423391 has 2 divisors, whose sum is σ = 99423392. Its totient is φ = 99423390.

The previous prime is 99423323. The next prime is 99423407. The reversal of 99423391 is 19332499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99423391 - 2²¹ = 97326239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99423691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49711695 + 49711696.

It is an arithmetic number, because the mean of its divisors is an integer number (49711696).

Almost surely, 2^99423391 is an apocalyptic number.

99423391 is a deficient number, since it is larger than the sum of its proper divisors (1).

99423391 is an equidigital number, since it uses as much as digits as its factorization.

99423391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 99423391 is about 9971.1278700055. The cubic root of 99423391 is about 463.2650358532.

The spelling of 99423391 in words is "ninety-nine million, four hundred twenty-three thousand, three hundred ninety-one".