1156161601 has 16 divisors (see below), whose sum is σ = 1351342080. Its totient is φ = 968544720.

The previous prime is 1156161593. The next prime is 1156161637. The reversal of 1156161601 is 1061616511.

It is a cyclic number.

It is not a de Polignac number, because 1156161601 - 2³ = 1156161593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1156161601.

It is not an unprimeable number, because it can be changed into a prime (1156161661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280566 + ... + 284656.

It is an arithmetic number, because the mean of its divisors is an integer number (84458880).

Almost surely, 2^1156161601 is an apocalyptic number.

It is an amenable number.

1156161601 is a deficient number, since it is larger than the sum of its proper divisors (195180479).

1156161601 is an equidigital number, since it uses as much as digits as its factorization.

1156161601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 1156161601 is about 34002.3764022458. The cubic root of 1156161601 is about 1049.5573647528.

The spelling of 1156161601 in words is "one billion, one hundred fifty-six million, one hundred sixty-one thousand, six hundred one".