56729121 has 8 divisors (see below), whose sum is σ = 75714240. Its totient is φ = 37781712.

The previous prime is 56729111. The next prime is 56729131. The reversal of 56729121 is 12192765.

It is an interprime number because it is at equal distance from previous prime (56729111) and next prime (56729131).

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

It is not a de Polignac number, because 56729121 - 2⁷ = 56728993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56729111) 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, 5706 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (9464280).

Almost surely, 2^56729121 is an apocalyptic number.

It is an amenable number.

56729121 is a deficient number, since it is larger than the sum of its proper divisors (18985119).

56729121 is a wasteful number, since it uses less digits than its factorization.

56729121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18855.

The product of its digits is 7560, while the sum is 33.

The square root of 56729121 is about 7531.8736712720. The cubic root of 56729121 is about 384.2395085145.

The spelling of 56729121 in words is "fifty-six million, seven hundred twenty-nine thousand, one hundred twenty-one".