23729161 has 8 divisors (see below), whose sum is σ = 25470504. Its totient is φ = 22026240.

The previous prime is 23729149. The next prime is 23729171. The reversal of 23729161 is 16192732.

23729161 = 3444² + 3445².

It can be written as a sum of positive squares in 4 ways, for example, as 11861136 + 11868025 = 3444^2 + 3445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23729161 - 2⁵ = 23729129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23729171) 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, 8320 + ... + 10801.

It is an arithmetic number, because the mean of its divisors is an integer number (3183813).

Almost surely, 2^23729161 is an apocalyptic number.

23729161 is the 3445-th centered square number.

It is an amenable number.

23729161 is a deficient number, since it is larger than the sum of its proper divisors (1741343).

23729161 is a wasteful number, since it uses less digits than its factorization.

23729161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19211.

The product of its digits is 4536, while the sum is 31.

The square root of 23729161 is about 4871.2586669156. The cubic root of 23729161 is about 287.3607582824.

The spelling of 23729161 in words is "twenty-three million, seven hundred twenty-nine thousand, one hundred sixty-one".