1156450661 has 4 divisors (see below), whose sum is σ = 1196328300. Its totient is φ = 1116573024.

The previous prime is 1156450657. The next prime is 1156450667. The reversal of 1156450661 is 1660546511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 680949025 + 475501636 = 26095^2 + 21806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156450661 - 2² = 1156450657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156450667) 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, 19938776 + ... + 19938833.

It is an arithmetic number, because the mean of its divisors is an integer number (299082075).

Almost surely, 2^1156450661 is an apocalyptic number.

It is an amenable number.

1156450661 is a deficient number, since it is larger than the sum of its proper divisors (39877639).

1156450661 is an equidigital number, since it uses as much as digits as its factorization.

1156450661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39877638.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1156450661 is about 34006.6267218611. The cubic root of 1156450661 is about 1049.6448265088.

The spelling of 1156450661 in words is "one billion, one hundred fifty-six million, four hundred fifty thousand, six hundred sixty-one".