90161537 has 4 divisors (see below), whose sum is σ = 90496980. Its totient is φ = 89826096.

The previous prime is 90161531. The next prime is 90161543. The reversal of 90161537 is 73516109.

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

It is an interprime number because it is at equal distance from previous prime (90161531) and next prime (90161543).

It can be written as a sum of positive squares in 2 ways, for example, as 51609856 + 38551681 = 7184^2 + 6209^2 .

It is a cyclic number.

It is not a de Polignac number, because 90161537 - 2⁴ = 90161521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90161531) 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, 167318 + ... + 167855.

It is an arithmetic number, because the mean of its divisors is an integer number (22624245).

Almost surely, 2^90161537 is an apocalyptic number.

It is an amenable number.

90161537 is a deficient number, since it is larger than the sum of its proper divisors (335443).

90161537 is a wasteful number, since it uses less digits than its factorization.

90161537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335442.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 90161537 is about 9495.3429111328. The cubic root of 90161537 is about 448.4084302126.

The spelling of 90161537 in words is "ninety million, one hundred sixty-one thousand, five hundred thirty-seven".