725231693 has 4 divisors (see below), whose sum is σ = 725294460. Its totient is φ = 725168928.

The previous prime is 725231603. The next prime is 725231707. The reversal of 725231693 is 396132527.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 396132527 = 7 ⋅56590361.

It can be written as a sum of positive squares in 2 ways, for example, as 527069764 + 198161929 = 22958^2 + 14077^2 .

It is a cyclic number.

It is not a de Polignac number, because 725231693 - 2¹⁰ = 725230669 is a prime.

It is a super-2 number, since 2×725231693² = 1051922017063292498, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725231603) 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, 8480 + ... + 39017.

It is an arithmetic number, because the mean of its divisors is an integer number (181323615).

Almost surely, 2^725231693 is an apocalyptic number.

It is an amenable number.

725231693 is a deficient number, since it is larger than the sum of its proper divisors (62767).

725231693 is a wasteful number, since it uses less digits than its factorization.

725231693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62766.

The product of its digits is 68040, while the sum is 38.

The square root of 725231693 is about 26930.1261229872. The cubic root of 725231693 is about 898.4465766723.

The spelling of 725231693 in words is "seven hundred twenty-five million, two hundred thirty-one thousand, six hundred ninety-three".