1167160721 has 4 divisors (see below), whose sum is σ = 1235817252. Its totient is φ = 1098504192.

The previous prime is 1167160663. The next prime is 1167160741. The reversal of 1167160721 is 1270617611.

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 522762496 + 644398225 = 22864^2 + 25385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1167160721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1167160741) 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, 34328240 + ... + 34328273.

It is an arithmetic number, because the mean of its divisors is an integer number (308954313).

Almost surely, 2^1167160721 is an apocalyptic number.

It is an amenable number.

1167160721 is a deficient number, since it is larger than the sum of its proper divisors (68656531).

1167160721 is an equidigital number, since it uses as much as digits as its factorization.

1167160721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68656530.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1167160721 is about 34163.7340025940. The cubic root of 1167160721 is about 1052.8751798204.

The spelling of 1167160721 in words is "one billion, one hundred sixty-seven million, one hundred sixty thousand, seven hundred twenty-one".