90961897 has 4 divisors (see below), whose sum is σ = 97958980. Its totient is φ = 83964816.

The previous prime is 90961891. The next prime is 90961907. The reversal of 90961897 is 79816909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56610576 + 34351321 = 7524^2 + 5861^2 .

It is not a de Polignac number, because 90961897 - 2⁷ = 90961769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90961897.

It is not an unprimeable number, because it can be changed into a prime (90961891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3498522 + ... + 3498547.

It is an arithmetic number, because the mean of its divisors is an integer number (24489745).

Almost surely, 2^90961897 is an apocalyptic number.

It is an amenable number.

90961897 is a deficient number, since it is larger than the sum of its proper divisors (6997083).

90961897 is a wasteful number, since it uses less digits than its factorization.

90961897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997082.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 90961897 is about 9537.3946652112. The cubic root of 90961897 is about 449.7313573521.

The spelling of 90961897 in words is "ninety million, nine hundred sixty-one thousand, eight hundred ninety-seven".