1691156613 has 4 divisors (see below), whose sum is σ = 2254875488. Its totient is φ = 1127437740.

The previous prime is 1691156573. The next prime is 1691156641. The reversal of 1691156613 is 3166511961.

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 not a de Polignac number, because 1691156613 - 2²⁰ = 1690108037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691152613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281859433 + ... + 281859438.

It is an arithmetic number, because the mean of its divisors is an integer number (563718872).

Almost surely, 2^1691156613 is an apocalyptic number.

It is an amenable number.

1691156613 is a deficient number, since it is larger than the sum of its proper divisors (563718875).

1691156613 is an equidigital number, since it uses as much as digits as its factorization.

1691156613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563718874.

The product of its digits is 29160, while the sum is 39.

The square root of 1691156613 is about 41123.6746047821. The cubic root of 1691156613 is about 1191.4100962057.

The spelling of 1691156613 in words is "one billion, six hundred ninety-one million, one hundred fifty-six thousand, six hundred thirteen".