90549431 has 8 divisors (see below), whose sum is σ = 104732544. Its totient is φ = 76678200.

The previous prime is 90549391. The next prime is 90549451. The reversal of 90549431 is 13494509.

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-90549431 is a prime.

It is a super-2 number, since 2×90549431² = 16398398908847522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90549391 and 90549400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90549451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77345 + ... + 78506.

It is an arithmetic number, because the mean of its divisors is an integer number (13091568).

Almost surely, 2^90549431 is an apocalyptic number.

90549431 is a deficient number, since it is larger than the sum of its proper divisors (14183113).

90549431 is a wasteful number, since it uses less digits than its factorization.

90549431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155941.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 90549431 is about 9515.7464762361. The cubic root of 90549431 is about 449.0505595319.

The spelling of 90549431 in words is "ninety million, five hundred forty-nine thousand, four hundred thirty-one".