99407581 has 8 divisors (see below), whose sum is σ = 122347904. Its totient is φ = 78652080.

The previous prime is 99407557. The next prime is 99407591. The reversal of 99407581 is 18570499.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99407581 - 2⁵ = 99407549 is a prime.

It is a super-2 number, since 2×99407581² = 19763734320543122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99407591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546105 + ... + 546286.

It is an arithmetic number, because the mean of its divisors is an integer number (15293488).

Almost surely, 2^99407581 is an apocalyptic number.

99407581 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

99407581 is a deficient number, since it is larger than the sum of its proper divisors (22940323).

99407581 is a wasteful number, since it uses less digits than its factorization.

99407581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092411.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 99407581 is about 9970.3350495357. The cubic root of 99407581 is about 463.2404788940.

The spelling of 99407581 in words is "ninety-nine million, four hundred seven thousand, five hundred eighty-one".