1391160561 has 8 divisors (see below), whose sum is σ = 2119863744. Its totient is φ = 794948880.

The previous prime is 1391160503. The next prime is 1391160583. The reversal of 1391160561 is 1650611931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1391160561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1391160361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33122850 + ... + 33122891.

It is an arithmetic number, because the mean of its divisors is an integer number (264982968).

Almost surely, 2^1391160561 is an apocalyptic number.

It is an amenable number.

1391160561 is a deficient number, since it is larger than the sum of its proper divisors (728703183).

1391160561 is an equidigital number, since it uses as much as digits as its factorization.

1391160561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66245751.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 1391160561 is about 37298.2648524030. The cubic root of 1391160561 is about 1116.3295449944.

The spelling of 1391160561 in words is "one billion, three hundred ninety-one million, one hundred sixty thousand, five hundred sixty-one".