755431421 has 4 divisors (see below), whose sum is σ = 756037500. Its totient is φ = 754825344.

The previous prime is 755431399. The next prime is 755431451. The reversal of 755431421 is 124134557.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124134557 = 3593 ⋅34549.

It can be written as a sum of positive squares in 2 ways, for example, as 207216025 + 548215396 = 14395^2 + 23414^2 .

It is a cyclic number.

It is not a de Polignac number, because 755431421 - 2²² = 751237117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (755431451) 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, 301166 + ... + 303663.

It is an arithmetic number, because the mean of its divisors is an integer number (189009375).

Almost surely, 2^755431421 is an apocalyptic number.

It is an amenable number.

755431421 is a deficient number, since it is larger than the sum of its proper divisors (606079).

755431421 is a wasteful number, since it uses less digits than its factorization.

755431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606078.

The product of its digits is 16800, while the sum is 32.

The square root of 755431421 is about 27485.1127157958. The cubic root of 755431421 is about 910.7482558829.

Adding to 755431421 its reverse (124134557), we get a palindrome (879565978).

The spelling of 755431421 in words is "seven hundred fifty-five million, four hundred thirty-one thousand, four hundred twenty-one".