1918627801 has 2 divisors, whose sum is σ = 1918627802. Its totient is φ = 1918627800.

The previous prime is 1918627783. The next prime is 1918627811. The reversal of 1918627801 is 1087268191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1874803401 + 43824400 = 43299^2 + 6620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918627801 - 2⁷ = 1918627673 is a prime.

It is a super-2 number, since 2×1918627801² = 7362265277540191202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1918627811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959313900 + 959313901.

It is an arithmetic number, because the mean of its divisors is an integer number (959313901).

Almost surely, 2^1918627801 is an apocalyptic number.

It is an amenable number.

1918627801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918627801 is an equidigital number, since it uses as much as digits as its factorization.

1918627801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1918627801 is about 43802.1437945679. The cubic root of 1918627801 is about 1242.5968386671.

The spelling of 1918627801 in words is "one billion, nine hundred eighteen million, six hundred twenty-seven thousand, eight hundred one".