18901031 has 2 divisors, whose sum is σ = 18901032. Its totient is φ = 18901030.

The previous prime is 18901027. The next prime is 18901061. The reversal of 18901031 is 13010981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18901031 - 2² = 18901027 is a prime.

It is a super-2 number, since 2×18901031² = 714497945725922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18900988 and 18901006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18901061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450515 + 9450516.

It is an arithmetic number, because the mean of its divisors is an integer number (9450516).

Almost surely, 2^18901031 is an apocalyptic number.

18901031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18901031 is an equidigital number, since it uses as much as digits as its factorization.

18901031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 18901031 is about 4347.5315985051. The cubic root of 18901031 is about 266.3760439745.

The spelling of 18901031 in words is "eighteen million, nine hundred one thousand, thirty-one".