990325261 has 2 divisors, whose sum is σ = 990325262. Its totient is φ = 990325260.

The previous prime is 990325247. The next prime is 990325289. The reversal of 990325261 is 162523099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900360036 + 89965225 = 30006^2 + 9485^2 .

It is a cyclic number.

It is not a de Polignac number, because 990325261 - 2⁵ = 990325229 is a prime.

It is a pancake number, because a pancake can be divided into 990325261 parts by 44504 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 990325261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990325211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495162630 + 495162631.

It is an arithmetic number, because the mean of its divisors is an integer number (495162631).

Almost surely, 2^990325261 is an apocalyptic number.

It is an amenable number.

990325261 is a deficient number, since it is larger than the sum of its proper divisors (1).

990325261 is an equidigital number, since it uses as much as digits as its factorization.

990325261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 990325261 is about 31469.4337572191. The cubic root of 990325261 is about 996.7646306742.

The spelling of 990325261 in words is "nine hundred ninety million, three hundred twenty-five thousand, two hundred sixty-one".