18071377 has 2 divisors, whose sum is σ = 18071378. Its totient is φ = 18071376.

The previous prime is 18071363. The next prime is 18071381. The reversal of 18071377 is 77317081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15928081 + 2143296 = 3991^2 + 1464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18071377 is a prime.

It is a super-2 number, since 2×18071377² = 653149333352258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18071387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035688 + 9035689.

It is an arithmetic number, because the mean of its divisors is an integer number (9035689).

Almost surely, 2^18071377 is an apocalyptic number.

It is an amenable number.

18071377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18071377 is an equidigital number, since it uses as much as digits as its factorization.

18071377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 18071377 is about 4251.0442246582. The cubic root of 18071377 is about 262.4200911721.

The spelling of 18071377 in words is "eighteen million, seventy-one thousand, three hundred seventy-seven".