90197489 has 4 divisors (see below), whose sum is σ = 91726320. Its totient is φ = 88668660.

The previous prime is 90197449. The next prime is 90197509. The reversal of 90197489 is 98479109.

90197489 = T₁₇₁₉ + T₁₇₂₀ + ... + T₁₇₇₇.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90197489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90197449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764327 + ... + 764444.

It is an arithmetic number, because the mean of its divisors is an integer number (22931580).

Almost surely, 2^90197489 is an apocalyptic number.

It is an amenable number.

90197489 is a deficient number, since it is larger than the sum of its proper divisors (1528831).

90197489 is a wasteful number, since it uses less digits than its factorization.

90197489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528830.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 90197489 is about 9497.2358610282. The cubic root of 90197489 is about 448.4680233907.

The spelling of 90197489 in words is "ninety million, one hundred ninety-seven thousand, four hundred eighty-nine".