31801089 has 4 divisors (see below), whose sum is σ = 42401456. Its totient is φ = 21200724.

The previous prime is 31801073. The next prime is 31801103. The reversal of 31801089 is 98010813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98010813 = 3 ⋅32670271.

It is not a de Polignac number, because 31801089 - 2⁴ = 31801073 is a prime.

It is a super-2 number, since 2×31801089² = 2022618523171842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31801489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5300179 + ... + 5300184.

It is an arithmetic number, because the mean of its divisors is an integer number (10600364).

Almost surely, 2^31801089 is an apocalyptic number.

It is an amenable number.

31801089 is a deficient number, since it is larger than the sum of its proper divisors (10600367).

31801089 is a wasteful number, since it uses less digits than its factorization.

31801089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600366.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 31801089 is about 5639.2454282466. The cubic root of 31801089 is about 316.8210269911.

The spelling of 31801089 in words is "thirty-one million, eight hundred one thousand, eighty-nine".