1215166451 has 16 divisors (see below), whose sum is σ = 1295147040. Its totient is φ = 1136851200.

The previous prime is 1215166441. The next prime is 1215166453. The reversal of 1215166451 is 1546615121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215166451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215166453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1175831 + ... + 1176863.

It is an arithmetic number, because the mean of its divisors is an integer number (80946690).

Almost surely, 2^1215166451 is an apocalyptic number.

1215166451 is a deficient number, since it is larger than the sum of its proper divisors (79980589).

1215166451 is a wasteful number, since it uses less digits than its factorization.

1215166451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766.

The product of its digits is 7200, while the sum is 32.

The square root of 1215166451 is about 34859.2376709532. The cubic root of 1215166451 is about 1067.1167173893.

The spelling of 1215166451 in words is "one billion, two hundred fifteen million, one hundred sixty-six thousand, four hundred fifty-one".