161736253 has 16 divisors (see below), whose sum is σ = 193547520. Its totient is φ = 132143616.

The previous prime is 161736233. The next prime is 161736301. The reversal of 161736253 is 352637161.

It is a cyclic number.

It is not a de Polignac number, because 161736253 - 2⁵ = 161736221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161736233) 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, 49453 + ... + 52621.

It is an arithmetic number, because the mean of its divisors is an integer number (12096720).

Almost surely, 2^161736253 is an apocalyptic number.

It is an amenable number.

161736253 is a deficient number, since it is larger than the sum of its proper divisors (31811267).

161736253 is a wasteful number, since it uses less digits than its factorization.

161736253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516.

The product of its digits is 22680, while the sum is 34.

The square root of 161736253 is about 12717.5568801559. The cubic root of 161736253 is about 544.8401775843.

The spelling of 161736253 in words is "one hundred sixty-one million, seven hundred thirty-six thousand, two hundred fifty-three".