1918164631 has 2 divisors, whose sum is σ = 1918164632. Its totient is φ = 1918164630.

The previous prime is 1918164583. The next prime is 1918164667. The reversal of 1918164631 is 1364618191.

It is a strong prime.

It is an emirp because it is prime and its reverse (1364618191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1918164631 - 2¹⁹ = 1917640343 is a prime.

It is a super-2 number, since 2×1918164631² = 7358711103238732322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918165631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959082315 + 959082316.

It is an arithmetic number, because the mean of its divisors is an integer number (959082316).

Almost surely, 2^1918164631 is an apocalyptic number.

1918164631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918164631 is an equidigital number, since it uses as much as digits as its factorization.

1918164631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 1918164631 is about 43796.8564054545. The cubic root of 1918164631 is about 1242.4968401341.

The spelling of 1918164631 in words is "one billion, nine hundred eighteen million, one hundred sixty-four thousand, six hundred thirty-one".