990597261 has 16 divisors (see below), whose sum is σ = 1333442880. Its totient is φ = 654097920.

The previous prime is 990597229. The next prime is 990597301. The reversal of 990597261 is 162795099.

It is not a de Polignac number, because 990597261 - 2⁵ = 990597229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990597261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990590261) 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, 189661 + ... + 194813.

It is an arithmetic number, because the mean of its divisors is an integer number (83340180).

Almost surely, 2^990597261 is an apocalyptic number.

It is an amenable number.

990597261 is a deficient number, since it is larger than the sum of its proper divisors (342845619).

990597261 is a wasteful number, since it uses less digits than its factorization.

990597261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5756.

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 990597261 is about 31473.7551143806. The cubic root of 990597261 is about 996.8558785272.

The spelling of 990597261 in words is "nine hundred ninety million, five hundred ninety-seven thousand, two hundred sixty-one".