90978553 has 2 divisors, whose sum is σ = 90978554. Its totient is φ = 90978552.

The previous prime is 90978499. The next prime is 90978599. The reversal of 90978553 is 35587909.

It is an a-pointer prime, because the next prime (90978599) can be obtained adding 90978553 to its sum of digits (46).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85155984 + 5822569 = 9228^2 + 2413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90978553 is a prime.

It is not a weakly prime, because it can be changed into another prime (90978053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45489276 + 45489277.

It is an arithmetic number, because the mean of its divisors is an integer number (45489277).

Almost surely, 2^90978553 is an apocalyptic number.

It is an amenable number.

90978553 is a deficient number, since it is larger than the sum of its proper divisors (1).

90978553 is an equidigital number, since it uses as much as digits as its factorization.

90978553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 90978553 is about 9538.2678196830. The cubic root of 90978553 is about 449.7588057255.

The spelling of 90978553 in words is "ninety million, nine hundred seventy-eight thousand, five hundred fifty-three".