725247551 has 4 divisors (see below), whose sum is σ = 828854352. Its totient is φ = 621640752.

The previous prime is 725247547. The next prime is 725247559. The reversal of 725247551 is 155742527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155742527 = 3989 ⋅39043.

It is a cyclic number.

It is not a de Polignac number, because 725247551 - 2² = 725247547 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 (725247559) 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, 51803390 + ... + 51803403.

It is an arithmetic number, because the mean of its divisors is an integer number (207213588).

Almost surely, 2^725247551 is an apocalyptic number.

725247551 is a deficient number, since it is larger than the sum of its proper divisors (103606801).

725247551 is a wasteful number, since it uses less digits than its factorization.

725247551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103606800.

The product of its digits is 98000, while the sum is 38.

The square root of 725247551 is about 26930.4205500026. The cubic root of 725247551 is about 898.4531251368.

The spelling of 725247551 in words is "seven hundred twenty-five million, two hundred forty-seven thousand, five hundred fifty-one".