90825661 has 2 divisors, whose sum is σ = 90825662. Its totient is φ = 90825660.

The previous prime is 90825653. The next prime is 90825673. The reversal of 90825661 is 16652809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 4761 = 9530^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 90825661 - 2³ = 90825653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90825661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90825601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45412830 + 45412831.

It is an arithmetic number, because the mean of its divisors is an integer number (45412831).

Almost surely, 2^90825661 is an apocalyptic number.

It is an amenable number.

90825661 is a deficient number, since it is larger than the sum of its proper divisors (1).

90825661 is an equidigital number, since it uses as much as digits as its factorization.

90825661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 90825661 is about 9530.2497868629. The cubic root of 90825661 is about 449.5067203812.

It can be divided in two parts, 908 and 25661, that added together give a square (26569 = 163²).

The spelling of 90825661 in words is "ninety million, eight hundred twenty-five thousand, six hundred sixty-one".