1918700761 has 2 divisors, whose sum is σ = 1918700762. Its totient is φ = 1918700760.

The previous prime is 1918700743. The next prime is 1918700783. The reversal of 1918700761 is 1670078191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1086032025 + 832668736 = 32955^2 + 28856^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918700761 - 2²⁹ = 1381829849 is a prime.

It is a super-2 number, since 2×1918700761² = 7362825220523958242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1918700741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959350380 + 959350381.

It is an arithmetic number, because the mean of its divisors is an integer number (959350381).

Almost surely, 2^1918700761 is an apocalyptic number.

It is an amenable number.

1918700761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918700761 is an equidigital number, since it uses as much as digits as its factorization.

1918700761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 40.

The square root of 1918700761 is about 43802.9766225995. The cubic root of 1918700761 is about 1242.6125892843.

The spelling of 1918700761 in words is "one billion, nine hundred eighteen million, seven hundred thousand, seven hundred sixty-one".