90861031 has 16 divisors (see below), whose sum is σ = 97689600. Its totient is φ = 84319200.

The previous prime is 90861019. The next prime is 90861041. The reversal of 90861031 is 13016809.

90861031 = 174² + 175² + ... + 652².

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90861031 is a prime.

It is a super-2 number, since 2×90861031² = 16511453908765922, 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 (90861041) 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 15 ways as a sum of consecutive naturals, for example, 189450 + ... + 189928.

It is an arithmetic number, because the mean of its divisors is an integer number (6105600).

Almost surely, 2^90861031 is an apocalyptic number.

90861031 is a deficient number, since it is larger than the sum of its proper divisors (6828569).

90861031 is a wasteful number, since it uses less digits than its factorization.

90861031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 90861031 is about 9532.1052763804. The cubic root of 90861031 is about 449.5650628846.

The spelling of 90861031 in words is "ninety million, eight hundred sixty-one thousand, thirty-one".