53991725 has 6 divisors (see below), whose sum is σ = 66949770. Its totient is φ = 43193360.

The previous prime is 53991719. The next prime is 53991809. The reversal of 53991725 is 52719935.

It can be written as a sum of positive squares in 3 ways, for example, as 2468041 + 51523684 = 1571^2 + 7178^2 .

It is not a de Polignac number, because 53991725 - 2⁶ = 53991661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1079810 + ... + 1079859.

It is an arithmetic number, because the mean of its divisors is an integer number (11158295).

Almost surely, 2^53991725 is an apocalyptic number.

It is an amenable number.

53991725 is a deficient number, since it is larger than the sum of its proper divisors (12958045).

53991725 is a wasteful number, since it uses less digits than its factorization.

53991725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159679 (or 2159674 counting only the distinct ones).

The product of its digits is 85050, while the sum is 41.

The square root of 53991725 is about 7347.9061643437. The cubic root of 53991725 is about 377.9570068587.

The spelling of 53991725 in words is "fifty-three million, nine hundred ninety-one thousand, seven hundred twenty-five".