1156212089 has 4 divisors (see below), whose sum is σ = 1162022400. Its totient is φ = 1150401780.

The previous prime is 1156212077. The next prime is 1156212097. The reversal of 1156212089 is 9802126511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9802126511 = 25237 ⋅388403.

It is a cyclic number.

It is not a de Polignac number, because 1156212089 - 2¹² = 1156207993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156212019) 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, 2904857 + ... + 2905254.

It is an arithmetic number, because the mean of its divisors is an integer number (290505600).

Almost surely, 2^1156212089 is an apocalyptic number.

It is an amenable number.

1156212089 is a deficient number, since it is larger than the sum of its proper divisors (5810311).

1156212089 is an equidigital number, since it uses as much as digits as its factorization.

1156212089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5810310.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 1156212089 is about 34003.1188128383. The cubic root of 1156212089 is about 1049.5726421099.

The spelling of 1156212089 in words is "one billion, one hundred fifty-six million, two hundred twelve thousand, eighty-nine".