90344381 has 4 divisors (see below), whose sum is σ = 90670812. Its totient is φ = 90017952.

The previous prime is 90344377. The next prime is 90344389. The reversal of 90344381 is 18344309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18344309 = 17 ⋅1079077.

It can be written as a sum of positive squares in 2 ways, for example, as 23921881 + 66422500 = 4891^2 + 8150^2 .

It is a cyclic number.

It is not a de Polignac number, because 90344381 - 2² = 90344377 is a prime.

It is a super-2 number, since 2×90344381² = 16324214356546322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90344389) 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, 162800 + ... + 163353.

It is an arithmetic number, because the mean of its divisors is an integer number (22667703).

Almost surely, 2^90344381 is an apocalyptic number.

It is an amenable number.

90344381 is a deficient number, since it is larger than the sum of its proper divisors (326431).

90344381 is a wasteful number, since it uses less digits than its factorization.

90344381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326430.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 90344381 is about 9504.9661230327. The cubic root of 90344381 is about 448.7113436750.

The spelling of 90344381 in words is "ninety million, three hundred forty-four thousand, three hundred eighty-one".