1518516997 has 2 divisors, whose sum is σ = 1518516998. Its totient is φ = 1518516996.

The previous prime is 1518516991. The next prime is 1518517001. The reversal of 1518516997 is 7996158151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242492001 + 276024996 = 35249^2 + 16614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1518516997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1518516991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 759258498 + 759258499.

It is an arithmetic number, because the mean of its divisors is an integer number (759258499).

Almost surely, 2^1518516997 is an apocalyptic number.

It is an amenable number.

1518516997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1518516997 is an equidigital number, since it uses as much as digits as its factorization.

1518516997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 52.

The square root of 1518516997 is about 38968.1536257493. The cubic root of 1518516997 is about 1149.4053629019.

The spelling of 1518516997 in words is "one billion, five hundred eighteen million, five hundred sixteen thousand, nine hundred ninety-seven".