50155721 has 16 divisors (see below), whose sum is σ = 63866880. Its totient is φ = 38248080.

The previous prime is 50155697. The next prime is 50155741. The reversal of 50155721 is 12755105.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 50155721 - 2⁶ = 50155657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (50155741) 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, 3311 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (3991680).

Almost surely, 2^50155721 is an apocalyptic number.

It is an amenable number.

50155721 is a deficient number, since it is larger than the sum of its proper divisors (13711159).

50155721 is a wasteful number, since it uses less digits than its factorization.

50155721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13924.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 50155721 is about 7082.0703893706. The cubic root of 50155721 is about 368.7852075547.

The spelling of 50155721 in words is "fifty million, one hundred fifty-five thousand, seven hundred twenty-one".