90151731 has 32 divisors (see below), whose sum is σ = 142274880. Its totient is φ = 56222208.

The previous prime is 90151729. The next prime is 90151741. The reversal of 90151731 is 13715109.

It is a happy number.

It is not a de Polignac number, because 90151731 - 2¹ = 90151729 is a prime.

It is a super-2 number, since 2×90151731² = 16254669204592722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 90151695 and 90151704.

It is not an unprimeable number, because it can be changed into a prime (90151741) 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 31 ways as a sum of consecutive naturals, for example, 89925 + ... + 90921.

It is an arithmetic number, because the mean of its divisors is an integer number (4446090).

Almost surely, 2^90151731 is an apocalyptic number.

90151731 is a deficient number, since it is larger than the sum of its proper divisors (52123149).

90151731 is a wasteful number, since it uses less digits than its factorization.

90151731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 27.

The square root of 90151731 is about 9494.8265386999. The cubic root of 90151731 is about 448.3921732712.

The spelling of 90151731 in words is "ninety million, one hundred fifty-one thousand, seven hundred thirty-one".