98623991 has 2 divisors, whose sum is σ = 98623992. Its totient is φ = 98623990.

The previous prime is 98623979. The next prime is 98623999. The reversal of 98623991 is 19932689.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98623991 is a prime.

It is a pancake number, because a pancake can be divided into 98623991 parts by 14044 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98623999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49311995 + 49311996.

It is an arithmetic number, because the mean of its divisors is an integer number (49311996).

Almost surely, 2^98623991 is an apocalyptic number.

98623991 is a deficient number, since it is larger than the sum of its proper divisors (1).

98623991 is an equidigital number, since it uses as much as digits as its factorization.

98623991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 98623991 is about 9930.9612324286. The cubic root of 98623991 is about 462.0200871435.

The spelling of 98623991 in words is "ninety-eight million, six hundred twenty-three thousand, nine hundred ninety-one".