1156456621 has 4 divisors (see below), whose sum is σ = 1156530172. Its totient is φ = 1156383072.

The previous prime is 1156456597. The next prime is 1156456681. The reversal of 1156456621 is 1266546511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 968080996 + 188375625 = 31114^2 + 13725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156456621 - 2⁷ = 1156456493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156456681) 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, 2610 + ... + 48163.

It is an arithmetic number, because the mean of its divisors is an integer number (289132543).

Almost surely, 2^1156456621 is an apocalyptic number.

It is an amenable number.

1156456621 is a deficient number, since it is larger than the sum of its proper divisors (73551).

1156456621 is an equidigital number, since it uses as much as digits as its factorization.

1156456621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73550.

The product of its digits is 43200, while the sum is 37.

The square root of 1156456621 is about 34006.7143517277. The cubic root of 1156456621 is about 1049.6466296906.

The spelling of 1156456621 in words is "one billion, one hundred fifty-six million, four hundred fifty-six thousand, six hundred twenty-one".