18070831 has 2 divisors, whose sum is σ = 18070832. Its totient is φ = 18070830.

The previous prime is 18070817. The next prime is 18070841. The reversal of 18070831 is 13807081.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13807081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18070831 - 2²³ = 9682223 is a prime.

It is a super-2 number, since 2×18070831² = 653109866061122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18070831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18070841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035415 + 9035416.

It is an arithmetic number, because the mean of its divisors is an integer number (9035416).

Almost surely, 2^18070831 is an apocalyptic number.

18070831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18070831 is an equidigital number, since it uses as much as digits as its factorization.

18070831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 18070831 is about 4250.9800046577. The cubic root of 18070831 is about 262.4174482669.

The spelling of 18070831 in words is "eighteen million, seventy thousand, eight hundred thirty-one".