90181097 has 4 divisors (see below), whose sum is σ = 93290820. Its totient is φ = 87071376.

The previous prime is 90181081. The next prime is 90181121. The reversal of 90181097 is 79018109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79018109 = 107 ⋅738487.

It can be written as a sum of positive squares in 2 ways, for example, as 60543961 + 29637136 = 7781^2 + 5444^2 .

It is a cyclic number.

It is not a de Polignac number, because 90181097 - 2⁴ = 90181081 is a prime.

It is a super-2 number, since 2×90181097² = 16265260512246818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90181027) 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, 1554818 + ... + 1554875.

It is an arithmetic number, because the mean of its divisors is an integer number (23322705).

Almost surely, 2^90181097 is an apocalyptic number.

It is an amenable number.

90181097 is a deficient number, since it is larger than the sum of its proper divisors (3109723).

90181097 is a wasteful number, since it uses less digits than its factorization.

90181097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109722.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 90181097 is about 9496.3728338772. The cubic root of 90181097 is about 448.4408543667.

The spelling of 90181097 in words is "ninety million, one hundred eighty-one thousand, ninety-seven".