1156605987 has 4 divisors (see below), whose sum is σ = 1542141320. Its totient is φ = 771070656.

The previous prime is 1156605973. The next prime is 1156606027. The reversal of 1156605987 is 7895066511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7895066511 = 3 ⋅2631688837.

It is not a de Polignac number, because 1156605987 - 2⁴ = 1156605971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156605937) 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, 192767662 + ... + 192767667.

It is an arithmetic number, because the mean of its divisors is an integer number (385535330).

Almost surely, 2^1156605987 is an apocalyptic number.

1156605987 is a deficient number, since it is larger than the sum of its proper divisors (385535333).

1156605987 is an equidigital number, since it uses as much as digits as its factorization.

1156605987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385535332.

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 1156605987 is about 34008.9104059510. The cubic root of 1156605987 is about 1049.6918179454.

The spelling of 1156605987 in words is "one billion, one hundred fifty-six million, six hundred five thousand, nine hundred eighty-seven".