1691961436 has 12 divisors (see below), whose sum is σ = 3230108280. Its totient is φ = 769073360.

The previous prime is 1691961379. The next prime is 1691961451. The reversal of 1691961436 is 6341691961.

It is a super-2 number, since 2×1691961436² = 5725467001822364192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19226791 + ... + 19226878.

It is an arithmetic number, because the mean of its divisors is an integer number (269175690).

Almost surely, 2^1691961436 is an apocalyptic number.

It is an amenable number.

1691961436 is a deficient number, since it is larger than the sum of its proper divisors (1538146844).

1691961436 is a wasteful number, since it uses less digits than its factorization.

1691961436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38453684 (or 38453682 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 1691961436 is about 41133.4588382742. The cubic root of 1691961436 is about 1191.5990639553.

The spelling of 1691961436 in words is "one billion, six hundred ninety-one million, nine hundred sixty-one thousand, four hundred thirty-six".