990087501 has 16 divisors (see below), whose sum is σ = 1422290240. Its totient is φ = 609016320.

The previous prime is 990087481. The next prime is 990087503. The reversal of 990087501 is 105780099.

It is a happy number.

It is not a de Polignac number, because 990087501 - 2⁹ = 990086989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990087501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990087503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119586 + ... + 127596.

It is an arithmetic number, because the mean of its divisors is an integer number (88893140).

Almost surely, 2^990087501 is an apocalyptic number.

It is an amenable number.

990087501 is a deficient number, since it is larger than the sum of its proper divisors (432202739).

990087501 is a wasteful number, since it uses less digits than its factorization.

990087501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11196.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 990087501 is about 31465.6558965485. The cubic root of 990087501 is about 996.6848556291.

The spelling of 990087501 in words is "nine hundred ninety million, eighty-seven thousand, five hundred one".