90442901 has 4 divisors (see below), whose sum is σ = 90501132. Its totient is φ = 90384672.

The previous prime is 90442871. The next prime is 90442939. The reversal of 90442901 is 10924409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10924409 = 41 ⋅266449.

It can be written as a sum of positive squares in 2 ways, for example, as 45900625 + 44542276 = 6775^2 + 6674^2 .

It is a cyclic number.

It is not a de Polignac number, because 90442901 - 2¹⁰ = 90441877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90442981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26720 + ... + 29913.

It is an arithmetic number, because the mean of its divisors is an integer number (22625283).

Almost surely, 2^90442901 is an apocalyptic number.

It is an amenable number.

90442901 is a deficient number, since it is larger than the sum of its proper divisors (58231).

90442901 is a wasteful number, since it uses less digits than its factorization.

90442901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58230.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 90442901 is about 9510.1472648955. The cubic root of 90442901 is about 448.8743900894.

The spelling of 90442901 in words is "ninety million, four hundred forty-two thousand, nine hundred one".