1691979033 has 4 divisors (see below), whose sum is σ = 2255972048. Its totient is φ = 1127986020.

The previous prime is 1691979019. The next prime is 1691979041. The reversal of 1691979033 is 3309791961.

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 1691979033 - 2²² = 1687784729 is a prime.

It is a super-2 number, since 2×1691979033² = 5725586096223230178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1691979053) 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, 281996503 + ... + 281996508.

It is an arithmetic number, because the mean of its divisors is an integer number (563993012).

Almost surely, 2^1691979033 is an apocalyptic number.

It is an amenable number.

1691979033 is a deficient number, since it is larger than the sum of its proper divisors (563993015).

1691979033 is an equidigital number, since it uses as much as digits as its factorization.

1691979033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563993014.

The product of its (nonzero) digits is 275562, while the sum is 48.

The square root of 1691979033 is about 41133.6727390103. The cubic root of 1691979033 is about 1191.6031949589.

The spelling of 1691979033 in words is "one billion, six hundred ninety-one million, nine hundred seventy-nine thousand, thirty-three".