18070891 has 2 divisors, whose sum is σ = 18070892. Its totient is φ = 18070890.

The previous prime is 18070867. The next prime is 18070963. The reversal of 18070891 is 19807081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18070891 - 2⁹ = 18070379 is a prime.

It is a super-3 number, since 3×18070891³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18070831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035445 + 9035446.

It is an arithmetic number, because the mean of its divisors is an integer number (9035446).

Almost surely, 2^18070891 is an apocalyptic number.

18070891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18070891 is an equidigital number, since it uses as much as digits as its factorization.

18070891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 18070891 is about 4250.9870618481. The cubic root of 18070891 is about 262.4177386986.

The spelling of 18070891 in words is "eighteen million, seventy thousand, eight hundred ninety-one".