90101601 has 6 divisors (see below), whose sum is σ = 130146770. Its totient is φ = 60067728.

The previous prime is 90101587. The next prime is 90101621. The reversal of 90101601 is 10610109.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 23270976 = 8175^2 + 4824^2 .

It is not a de Polignac number, because 90101601 - 2⁵ = 90101569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90101621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5005636 + ... + 5005653.

Almost surely, 2^90101601 is an apocalyptic number.

It is an amenable number.

90101601 is a deficient number, since it is larger than the sum of its proper divisors (40045169).

90101601 is a wasteful number, since it uses less digits than its factorization.

90101601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011295 (or 10011292 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 90101601 is about 9492.1863129629. The cubic root of 90101601 is about 448.3090464986.

The spelling of 90101601 in words is "ninety million, one hundred one thousand, six hundred one".