161691435 has 24 divisors (see below), whose sum is σ = 284453520. Its totient is φ = 84946752.

The previous prime is 161691427. The next prime is 161691451. The reversal of 161691435 is 534196161.

161691435 is a `hidden beast` number, since 1 + 616 + 9 + 1 + 4 + 35 = 666.

It is not a de Polignac number, because 161691435 - 2³ = 161691427 is a prime.

It is a super-2 number, since 2×161691435² = 52288240304718450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161691435.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23800 + ... + 29829.

It is an arithmetic number, because the mean of its divisors is an integer number (11852230).

Almost surely, 2^161691435 is an apocalyptic number.

161691435 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161691435 is a deficient number, since it is larger than the sum of its proper divisors (122762085).

161691435 is a wasteful number, since it uses less digits than its factorization.

161691435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53707 (or 53704 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 161691435 is about 12715.7947057980. The cubic root of 161691435 is about 544.7898468710.

The spelling of 161691435 in words is "one hundred sixty-one million, six hundred ninety-one thousand, four hundred thirty-five".