725162281 has 4 divisors (see below), whose sum is σ = 725585364. Its totient is φ = 724739200.

The previous prime is 725162279. The next prime is 725162293. The reversal of 725162281 is 182261527.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 344288025 + 380874256 = 18555^2 + 19516^2 .

It is a cyclic number.

It is not a de Polignac number, because 725162281 - 2¹ = 725162279 is a prime.

It is a super-2 number, since 2×725162281² = 1051720667570245922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725162981) 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, 208960 + ... + 212401.

It is an arithmetic number, because the mean of its divisors is an integer number (181396341).

Almost surely, 2^725162281 is an apocalyptic number.

It is an amenable number.

725162281 is a deficient number, since it is larger than the sum of its proper divisors (423083).

725162281 is a wasteful number, since it uses less digits than its factorization.

725162281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423082.

The product of its digits is 13440, while the sum is 34.

The square root of 725162281 is about 26928.8373495775. The cubic root of 725162281 is about 898.4179122863.

The spelling of 725162281 in words is "seven hundred twenty-five million, one hundred sixty-two thousand, two hundred eighty-one".