1156555451 has 4 divisors (see below), whose sum is σ = 1156695000. Its totient is φ = 1156415904.

The previous prime is 1156555397. The next prime is 1156555481. The reversal of 1156555451 is 1545556511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1156555451 - 2²⁶ = 1089446587 is a prime.

It is a super-2 number, since 2×1156555451² = 2675241022475626802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156555481) 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, 56501 + ... + 74198.

It is an arithmetic number, because the mean of its divisors is an integer number (289173750).

Almost surely, 2^1156555451 is an apocalyptic number.

1156555451 is a deficient number, since it is larger than the sum of its proper divisors (139549).

1156555451 is an equidigital number, since it uses as much as digits as its factorization.

1156555451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139548.

The product of its digits is 75000, while the sum is 38.

The square root of 1156555451 is about 34008.1674160782. The cubic root of 1156555451 is about 1049.6765295357.

The spelling of 1156555451 in words is "one billion, one hundred fifty-six million, five hundred fifty-five thousand, four hundred fifty-one".