18917029 has 2 divisors, whose sum is σ = 18917030. Its totient is φ = 18917028.

The previous prime is 18917011. The next prime is 18917053. The reversal of 18917029 is 92071981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 2024929 = 4110^2 + 1423^2 .

It is a cyclic number.

It is not a de Polignac number, because 18917029 - 2¹⁷ = 18785957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18917009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458514 + 9458515.

It is an arithmetic number, because the mean of its divisors is an integer number (9458515).

Almost surely, 2^18917029 is an apocalyptic number.

It is an amenable number.

18917029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18917029 is an equidigital number, since it uses as much as digits as its factorization.

18917029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18917029 is about 4349.3711039643. The cubic root of 18917029 is about 266.4511771282.

The spelling of 18917029 in words is "eighteen million, nine hundred seventeen thousand, twenty-nine".