1216555454 has 8 divisors (see below), whose sum is σ = 1842550320. Its totient is φ = 602372016.

The previous prime is 1216555453. The next prime is 1216555493. The reversal of 1216555454 is 4545556121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1216555454² = 2960014345314292232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216555451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2952599 + ... + 2953010.

It is an arithmetic number, because the mean of its divisors is an integer number (230318790).

Almost surely, 2^1216555454 is an apocalyptic number.

1216555454 is a deficient number, since it is larger than the sum of its proper divisors (625994866).

1216555454 is a wasteful number, since it uses less digits than its factorization.

1216555454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905714.

The product of its digits is 120000, while the sum is 38.

The square root of 1216555454 is about 34879.1550069666. The cubic root of 1216555454 is about 1067.5231538689.

The spelling of 1216555454 in words is "one billion, two hundred sixteen million, five hundred fifty-five thousand, four hundred fifty-four".