161634836 has 12 divisors (see below), whose sum is σ = 308575680. Its totient is φ = 73470360.

The previous prime is 161634829. The next prime is 161634857. The reversal of 161634836 is 638436161.

It is a happy number.

It is a super-2 number, since 2×161634836² = 52251640417493792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 161634836.

It is a congruent number.

It is an unprimeable number.

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, 1836716 + ... + 1836803.

It is an arithmetic number, because the mean of its divisors is an integer number (25714640).

Almost surely, 2^161634836 is an apocalyptic number.

It is an amenable number.

161634836 is a deficient number, since it is larger than the sum of its proper divisors (146940844).

161634836 is a wasteful number, since it uses less digits than its factorization.

161634836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673534 (or 3673532 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 161634836 is about 12713.5689717719. The cubic root of 161634836 is about 544.7262727779.

The spelling of 161634836 in words is "one hundred sixty-one million, six hundred thirty-four thousand, eight hundred thirty-six".