90561431 has 8 divisors (see below), whose sum is σ = 96878880. Its totient is φ = 84354048.

The previous prime is 90561407. The next prime is 90561437. The reversal of 90561431 is 13416509.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90561431 is a prime.

It is a super-2 number, since 2×90561431² = 16402745569535522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90561394 and 90561403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90561437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25811 + ... + 29108.

It is an arithmetic number, because the mean of its divisors is an integer number (12109860).

Almost surely, 2^90561431 is an apocalyptic number.

90561431 is a deficient number, since it is larger than the sum of its proper divisors (6317449).

90561431 is a wasteful number, since it uses less digits than its factorization.

90561431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55033.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 90561431 is about 9516.3769891698. The cubic root of 90561431 is about 449.0703953595.

The spelling of 90561431 in words is "ninety million, five hundred sixty-one thousand, four hundred thirty-one".