161723534 has 16 divisors (see below), whose sum is σ = 289294848. Its totient is φ = 66296472.

The previous prime is 161723521. The next prime is 161723537. The reversal of 161723534 is 435327161.

161723534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161723534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161723537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250802 + ... + 251445.

It is an arithmetic number, because the mean of its divisors is an integer number (18080928).

Almost surely, 2^161723534 is an apocalyptic number.

161723534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161723534 is a deficient number, since it is larger than the sum of its proper divisors (127571314).

161723534 is a wasteful number, since it uses less digits than its factorization.

161723534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502279.

The product of its digits is 15120, while the sum is 32.

The square root of 161723534 is about 12717.0568135870. The cubic root of 161723534 is about 544.8258950642.

The spelling of 161723534 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, five hundred thirty-four".