725403451 has 4 divisors (see below), whose sum is σ = 763582600. Its totient is φ = 687224304.

The previous prime is 725403449. The next prime is 725403487. The reversal of 725403451 is 154304527.

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 725403451 - 2¹ = 725403449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725400451) 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, 19089546 + ... + 19089583.

It is an arithmetic number, because the mean of its divisors is an integer number (190895650).

Almost surely, 2^725403451 is an apocalyptic number.

725403451 is a deficient number, since it is larger than the sum of its proper divisors (38179149).

725403451 is a wasteful number, since it uses less digits than its factorization.

725403451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38179148.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 725403451 is about 26933.3148906703. The cubic root of 725403451 is about 898.5174980105.

Adding to 725403451 its reverse (154304527), we get a palindrome (879707978).

The spelling of 725403451 in words is "seven hundred twenty-five million, four hundred three thousand, four hundred fifty-one".