99937381 has 2 divisors, whose sum is σ = 99937382. Its totient is φ = 99937380.

The previous prime is 99937367. The next prime is 99937391. The reversal of 99937381 is 18373999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99321156 + 616225 = 9966^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 99937381 - 2¹⁵ = 99904613 is a prime.

It is a super-2 number, since 2×99937381² = 19974960242278322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99937351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49968690 + 49968691.

It is an arithmetic number, because the mean of its divisors is an integer number (49968691).

Almost surely, 2^99937381 is an apocalyptic number.

It is an amenable number.

99937381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99937381 is an equidigital number, since it uses as much as digits as its factorization.

99937381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 99937381 is about 9996.8685597041. The cubic root of 99937381 is about 464.0619792479.

The spelling of 99937381 in words is "ninety-nine million, nine hundred thirty-seven thousand, three hundred eighty-one".