1181961659 has 4 divisors (see below), whose sum is σ = 1182485304. Its totient is φ = 1181438016.

The previous prime is 1181961647. The next prime is 1181961667. The reversal of 1181961659 is 9561691811.

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

It is a cyclic number.

It is not a de Polignac number, because 1181961659 - 2⁴ = 1181961643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181961059) 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, 258422 + ... + 262955.

It is an arithmetic number, because the mean of its divisors is an integer number (295621326).

Almost surely, 2^1181961659 is an apocalyptic number.

1181961659 is a deficient number, since it is larger than the sum of its proper divisors (523645).

1181961659 is an equidigital number, since it uses as much as digits as its factorization.

1181961659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523644.

The product of its digits is 116640, while the sum is 47.

The square root of 1181961659 is about 34379.6692683336. The cubic root of 1181961659 is about 1057.3070539043.

The spelling of 1181961659 in words is "one billion, one hundred eighty-one million, nine hundred sixty-one thousand, six hundred fifty-nine".