1918297061 has 2 divisors, whose sum is σ = 1918297062. Its totient is φ = 1918297060.

The previous prime is 1918297021. The next prime is 1918297093. The reversal of 1918297061 is 1607928191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1860628225 + 57668836 = 43135^2 + 7594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918297061 - 2³⁰ = 844555237 is a prime.

It is a super-2 number, since 2×1918297061² = 7359727228482475442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918297021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959148530 + 959148531.

It is an arithmetic number, because the mean of its divisors is an integer number (959148531).

Almost surely, 2^1918297061 is an apocalyptic number.

It is an amenable number.

1918297061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918297061 is an equidigital number, since it uses as much as digits as its factorization.

1918297061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 44.

The square root of 1918297061 is about 43798.3682458605. The cubic root of 1918297061 is about 1242.5254334514.

The spelling of 1918297061 in words is "one billion, nine hundred eighteen million, two hundred ninety-seven thousand, sixty-one".