90173147 has 4 divisors (see below), whose sum is σ = 90195696. Its totient is φ = 90150600.

The previous prime is 90173143. The next prime is 90173191. The reversal of 90173147 is 74137109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74137109 = 6373 ⋅11633.

It is a cyclic number.

It is not a de Polignac number, because 90173147 - 2² = 90173143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90173143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3479 + ... + 13872.

It is an arithmetic number, because the mean of its divisors is an integer number (22548924).

Almost surely, 2^90173147 is an apocalyptic number.

90173147 is a deficient number, since it is larger than the sum of its proper divisors (22549).

90173147 is a wasteful number, since it uses less digits than its factorization.

90173147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22548.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 90173147 is about 9495.9542437819. The cubic root of 90173147 is about 448.4276764034.

The spelling of 90173147 in words is "ninety million, one hundred seventy-three thousand, one hundred forty-seven".