99090401 has 2 divisors, whose sum is σ = 99090402. Its totient is φ = 99090400.

The previous prime is 99090391. The next prime is 99090427. The reversal of 99090401 is 10409099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62789776 + 36300625 = 7924^2 + 6025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99090401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99090461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49545200 + 49545201.

It is an arithmetic number, because the mean of its divisors is an integer number (49545201).

Almost surely, 2^99090401 is an apocalyptic number.

It is an amenable number.

99090401 is a deficient number, since it is larger than the sum of its proper divisors (1).

99090401 is an equidigital number, since it uses as much as digits as its factorization.

99090401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 99090401 is about 9954.4161556567. The cubic root of 99090401 is about 462.7472664655.

The spelling of 99090401 in words is "ninety-nine million, ninety thousand, four hundred one".