18951929 has 2 divisors, whose sum is σ = 18951930. Its totient is φ = 18951928.

The previous prime is 18951893. The next prime is 18951953. The reversal of 18951929 is 92915981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 6135529 = 3580^2 + 2477^2 .

It is an emirp because it is prime and its reverse (92915981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18951929 is a prime.

It is a super-2 number, since 2×18951929² = 718351225642082, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18951929.

It is not a weakly prime, because it can be changed into another prime (18951029) 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 as a sum of consecutive naturals, namely, 9475964 + 9475965.

It is an arithmetic number, because the mean of its divisors is an integer number (9475965).

Almost surely, 2^18951929 is an apocalyptic number.

It is an amenable number.

18951929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18951929 is an equidigital number, since it uses as much as digits as its factorization.

18951929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 44.

The square root of 18951929 is about 4353.3813294955. The cubic root of 18951929 is about 266.6149349303.

The spelling of 18951929 in words is "eighteen million, nine hundred fifty-one thousand, nine hundred twenty-nine".