31801104 has 30 divisors (see below), whose sum is σ = 88999326. Its totient is φ = 10600320.

The previous prime is 31801103. The next prime is 31801127. The reversal of 31801104 is 40110813.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 12616704 = 4380^2 + 3552^2 .

It is a super-2 number, since 2×31801104² = 2022620431237632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31801103) 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 5 ways as a sum of consecutive naturals, for example, 110277 + ... + 110564.

Almost surely, 2^31801104 is an apocalyptic number.

It is an amenable number.

31801104 is an abundant number, since it is smaller than the sum of its proper divisors (57198222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31801104 is a wasteful number, since it uses less digits than its factorization.

31801104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220855 (or 220846 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 31801104 is about 5639.2467582116. The cubic root of 31801104 is about 316.8210768040.

Adding to 31801104 its reverse (40110813), we get a palindrome (71911917).

The spelling of 31801104 in words is "thirty-one million, eight hundred one thousand, one hundred four".