990309525 has 24 divisors (see below), whose sum is σ = 1642615104. Its totient is φ = 526454400.

The previous prime is 990309521. The next prime is 990309547. The reversal of 990309525 is 525903099.

It is not a de Polignac number, because 990309525 - 2² = 990309521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990309521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2097 + ... + 44553.

It is an arithmetic number, because the mean of its divisors is an integer number (68442296).

Almost surely, 2^990309525 is an apocalyptic number.

It is an amenable number.

990309525 is a deficient number, since it is larger than the sum of its proper divisors (652305579).

990309525 is a wasteful number, since it uses less digits than its factorization.

990309525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42781 (or 42776 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 42.

The square root of 990309525 is about 31469.1837358391. The cubic root of 990309525 is about 996.7593512063.

The spelling of 990309525 in words is "nine hundred ninety million, three hundred nine thousand, five hundred twenty-five".