90161431 has 4 divisors (see below), whose sum is σ = 91507192. Its totient is φ = 88815672.

The previous prime is 90161371. The next prime is 90161453. The reversal of 90161431 is 13416109.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90161431 - 2¹⁷ = 90030359 is a prime.

It is a super-2 number, since 2×90161431² = 16258167279935522, 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 = 90161396 and 90161405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90161531) 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, 672780 + ... + 672913.

It is an arithmetic number, because the mean of its divisors is an integer number (22876798).

Almost surely, 2^90161431 is an apocalyptic number.

90161431 is a deficient number, since it is larger than the sum of its proper divisors (1345761).

90161431 is a wasteful number, since it uses less digits than its factorization.

90161431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345760.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 90161431 is about 9495.3373294475. The cubic root of 90161431 is about 448.4082544861.

The spelling of 90161431 in words is "ninety million, one hundred sixty-one thousand, four hundred thirty-one".