751421 has 4 divisors (see below), whose sum is σ = 819744. Its totient is φ = 683100.

The previous prime is 751411. The next prime is 751423. The reversal of 751421 is 124157.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124157 = 11 ⋅11287.

It is not a de Polignac number, because 751421 - 2⁶ = 751357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 751393 and 751402.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 751421.

It is not an unprimeable number, because it can be changed into a prime (751423) 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, 34145 + ... + 34166.

It is an arithmetic number, because the mean of its divisors is an integer number (204936).

2⁷⁵¹⁴²¹ is an apocalyptic number.

It is an amenable number.

751421 is a deficient number, since it is larger than the sum of its proper divisors (68323).

751421 is a wasteful number, since it uses less digits than its factorization.

751421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68322.

The product of its digits is 280, while the sum is 20.

The square root of 751421 is about 866.8454302815. The cubic root of 751421 is about 90.9133740709.

Adding to 751421 its reverse (124157), we get a palindrome (875578).

Subtracting from 751421 its reverse (124157), we obtain a square (627264 = 792²).

The spelling of 751421 in words is "seven hundred fifty-one thousand, four hundred twenty-one".