99581401 has 2 divisors, whose sum is σ = 99581402. Its totient is φ = 99581400.

The previous prime is 99581399. The next prime is 99581411. The reversal of 99581401 is 10418599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65999376 + 33582025 = 8124^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 99581401 - 2¹ = 99581399 is a prime.

It is a super-3 number, since 3×99581401³ (a number of 25 digits) contains 333 as substring.

Together with 99581399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99581411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49790700 + 49790701.

It is an arithmetic number, because the mean of its divisors is an integer number (49790701).

Almost surely, 2^99581401 is an apocalyptic number.

It is an amenable number.

99581401 is a deficient number, since it is larger than the sum of its proper divisors (1).

99581401 is an equidigital number, since it uses as much as digits as its factorization.

99581401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 99581401 is about 9979.0481008962. The cubic root of 99581401 is about 463.5103227469.

The spelling of 99581401 in words is "ninety-nine million, five hundred eighty-one thousand, four hundred one".