18950431 has 2 divisors, whose sum is σ = 18950432. Its totient is φ = 18950430.

The previous prime is 18950389. The next prime is 18950453. The reversal of 18950431 is 13405981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18950431 - 2⁷ = 18950303 is a prime.

It is a super-2 number, since 2×18950431² = 718237670171522, 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 = 18950393 and 18950402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18950471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9475215 + 9475216.

It is an arithmetic number, because the mean of its divisors is an integer number (9475216).

Almost surely, 2^18950431 is an apocalyptic number.

18950431 is a deficient number, since it is larger than the sum of its proper divisors (1).

18950431 is an equidigital number, since it uses as much as digits as its factorization.

18950431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 18950431 is about 4353.2092759251. The cubic root of 18950431 is about 266.6079101450.

The spelling of 18950431 in words is "eighteen million, nine hundred fifty thousand, four hundred thirty-one".