1518116261 has 2 divisors, whose sum is σ = 1518116262. Its totient is φ = 1518116260.

The previous prime is 1518116239. The next prime is 1518116287. The reversal of 1518116261 is 1626118151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1463445025 + 54671236 = 38255^2 + 7394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1518116261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1518116461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 759058130 + 759058131.

It is an arithmetic number, because the mean of its divisors is an integer number (759058131).

Almost surely, 2^1518116261 is an apocalyptic number.

It is an amenable number.

1518116261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1518116261 is an equidigital number, since it uses as much as digits as its factorization.

1518116261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 32.

The square root of 1518116261 is about 38963.0114467555. The cubic root of 1518116261 is about 1149.3042448083.

The spelling of 1518116261 in words is "one billion, five hundred eighteen million, one hundred sixteen thousand, two hundred sixty-one".