1159213961 has 4 divisors (see below), whose sum is σ = 1209614592. Its totient is φ = 1108813332.

The previous prime is 1159213949. The next prime is 1159214029. The reversal of 1159213961 is 1693129511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1159213961 - 2¹⁴ = 1159197577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1159213931) 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, 25200281 + ... + 25200326.

It is an arithmetic number, because the mean of its divisors is an integer number (302403648).

Almost surely, 2^1159213961 is an apocalyptic number.

It is an amenable number.

1159213961 is a deficient number, since it is larger than the sum of its proper divisors (50400631).

1159213961 is an equidigital number, since it uses as much as digits as its factorization.

1159213961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50400630.

The product of its digits is 14580, while the sum is 38.

The square root of 1159213961 is about 34047.2313264970. The cubic root of 1159213961 is about 1050.4801918515.

The spelling of 1159213961 in words is "one billion, one hundred fifty-nine million, two hundred thirteen thousand, nine hundred sixty-one".