50721431 has 4 divisors (see below), whose sum is σ = 53391000. Its totient is φ = 48051864.

The previous prime is 50721409. The next prime is 50721443. The reversal of 50721431 is 13412705.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13412705 = 5 ⋅2682541.

It is a cyclic number.

It is not a de Polignac number, because 50721431 - 2¹⁸ = 50459287 is a prime.

It is a super-2 number, since 2×50721431² = 5145327125375522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 50721397 and 50721406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50721481) 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, 1334756 + ... + 1334793.

It is an arithmetic number, because the mean of its divisors is an integer number (13347750).

Almost surely, 2^50721431 is an apocalyptic number.

50721431 is a deficient number, since it is larger than the sum of its proper divisors (2669569).

50721431 is a wasteful number, since it uses less digits than its factorization.

50721431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669568.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 50721431 is about 7121.8979914065. The cubic root of 50721431 is about 370.1665454271.

The spelling of 50721431 in words is "fifty million, seven hundred twenty-one thousand, four hundred thirty-one".