90199045 has 4 divisors (see below), whose sum is σ = 108238860. Its totient is φ = 72159232.

The previous prime is 90199037. The next prime is 90199069. The reversal of 90199045 is 54099109.

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 50041476 + 40157569 = 7074^2 + 6337^2 .

It is a cyclic number.

It is not a de Polignac number, because 90199045 - 2³ = 90199037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90198995 and 90199013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9019900 + ... + 9019909.

It is an arithmetic number, because the mean of its divisors is an integer number (27059715).

Almost surely, 2^90199045 is an apocalyptic number.

It is an amenable number.

90199045 is a deficient number, since it is larger than the sum of its proper divisors (18039815).

90199045 is a wasteful number, since it uses less digits than its factorization.

90199045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18039814.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 90199045 is about 9497.3177792469. The cubic root of 90199045 is about 448.4706022216.

The spelling of 90199045 in words is "ninety million, one hundred ninety-nine thousand, forty-five".