50721691 has 4 divisors (see below), whose sum is σ = 50758192. Its totient is φ = 50685192.

The previous prime is 50721679. The next prime is 50721701. The reversal of 50721691 is 19612705.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 50721691 - 2¹⁷ = 50590619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50721631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16080 + ... + 18973.

It is an arithmetic number, because the mean of its divisors is an integer number (12689548).

Almost surely, 2^50721691 is an apocalyptic number.

50721691 is a deficient number, since it is larger than the sum of its proper divisors (36501).

50721691 is a wasteful number, since it uses less digits than its factorization.

50721691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36500.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 50721691 is about 7121.9162449442. The cubic root of 50721691 is about 370.1671779219.

The spelling of 50721691 in words is "fifty million, seven hundred twenty-one thousand, six hundred ninety-one".