161689310 has 32 divisors (see below), whose sum is σ = 305059392. Its totient is φ = 61585920.

The previous prime is 161689309. The next prime is 161689313. The reversal of 161689310 is 13986161.

It is a super-2 number, since 2×161689310² = 52286865936552200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161689313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53972 + ... + 56888.

It is an arithmetic number, because the mean of its divisors is an integer number (9533106).

Almost surely, 2^161689310 is an apocalyptic number.

161689310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161689310 is a deficient number, since it is larger than the sum of its proper divisors (143370082).

161689310 is a wasteful number, since it uses less digits than its factorization.

161689310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 161689310 is about 12715.7111480247. The cubic root of 161689310 is about 544.7874602604.

The spelling of 161689310 in words is "one hundred sixty-one million, six hundred eighty-nine thousand, three hundred ten".