90897155 has 8 divisors (see below), whose sum is σ = 109145232. Its totient is φ = 72671968.

The previous prime is 90897151. The next prime is 90897161. The reversal of 90897155 is 55179809.

It is a happy number.

It is a Cunningham number, because it is equal to 9534²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90897155 - 2² = 90897151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90897151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4769 + ... + 14301.

It is an arithmetic number, because the mean of its divisors is an integer number (13643154).

Almost surely, 2^90897155 is an apocalyptic number.

90897155 is a deficient number, since it is larger than the sum of its proper divisors (18248077).

90897155 is a wasteful number, since it uses less digits than its factorization.

90897155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11445.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 90897155 is about 9533.9999475561. Note that the first 4 decimals coincide. The cubic root of 90897155 is about 449.6246334779.

The spelling of 90897155 in words is "ninety million, eight hundred ninety-seven thousand, one hundred fifty-five".