725251551 has 4 divisors (see below), whose sum is σ = 967002072. Its totient is φ = 483501032.

The previous prime is 725251547. The next prime is 725251567. The reversal of 725251551 is 155152527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155152527 = 3 ⋅51717509.

It is a cyclic number.

It is not a de Polignac number, because 725251551 - 2² = 725251547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725251591) 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, 120875256 + ... + 120875261.

It is an arithmetic number, because the mean of its divisors is an integer number (241750518).

Almost surely, 2^725251551 is an apocalyptic number.

725251551 is a deficient number, since it is larger than the sum of its proper divisors (241750521).

725251551 is a wasteful number, since it uses less digits than its factorization.

725251551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241750520.

The product of its digits is 17500, while the sum is 33.

The square root of 725251551 is about 26930.4948153576. The cubic root of 725251551 is about 898.4547768974.

The spelling of 725251551 in words is "seven hundred twenty-five million, two hundred fifty-one thousand, five hundred fifty-one".