99121937 has 2 divisors, whose sum is σ = 99121938. Its totient is φ = 99121936.

The previous prime is 99121931. The next prime is 99121949. The reversal of 99121937 is 73912199.

It is a Cunningham number, because it is equal to 9956²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99121936 + 1 = 9956^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 99121937 - 2²⁰ = 98073361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99121894 and 99121903.

It is not a weakly prime, because it can be changed into another prime (99121931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49560968 + 49560969.

It is an arithmetic number, because the mean of its divisors is an integer number (49560969).

Almost surely, 2^99121937 is an apocalyptic number.

It is an amenable number.

99121937 is a deficient number, since it is larger than the sum of its proper divisors (1).

99121937 is an equidigital number, since it uses as much as digits as its factorization.

99121937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 41.

The square root of 99121937 is about 9956.0000502210. Note that the first 4 decimals coincide. The cubic root of 99121937 is about 462.7963517782.

The spelling of 99121937 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred thirty-seven".