1187670817 has 4 divisors (see below), whose sum is σ = 1199430036. Its totient is φ = 1175911600.

The previous prime is 1187670811. The next prime is 1187670823. The reversal of 1187670817 is 7180767811.

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

It is an interprime number because it is at equal distance from previous prime (1187670811) and next prime (1187670823).

It can be written as a sum of positive squares in 2 ways, for example, as 709636321 + 478034496 = 26639^2 + 21864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187670817 - 2⁷ = 1187670689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187670811) 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, 5879458 + ... + 5879659.

It is an arithmetic number, because the mean of its divisors is an integer number (299857509).

Almost surely, 2^1187670817 is an apocalyptic number.

It is an amenable number.

1187670817 is a deficient number, since it is larger than the sum of its proper divisors (11759219).

1187670817 is a wasteful number, since it uses less digits than its factorization.

1187670817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11759218.

The product of its (nonzero) digits is 131712, while the sum is 46.

The square root of 1187670817 is about 34462.6002646347. The cubic root of 1187670817 is about 1059.0066691154.

The spelling of 1187670817 in words is "one billion, one hundred eighty-seven million, six hundred seventy thousand, eight hundred seventeen".