61811725 has 6 divisors (see below), whose sum is σ = 76646570. Its totient is φ = 49449360.

The previous prime is 61811713. The next prime is 61811747. The reversal of 61811725 is 52711816.

It can be written as a sum of positive squares in 3 ways, for example, as 19027044 + 42784681 = 4362^2 + 6541^2 .

It is not a de Polignac number, because 61811725 - 2¹⁵ = 61778957 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, 1236210 + ... + 1236259.

Almost surely, 2^61811725 is an apocalyptic number.

It is an amenable number.

61811725 is a deficient number, since it is larger than the sum of its proper divisors (14834845).

61811725 is a wasteful number, since it uses less digits than its factorization.

61811725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472479 (or 2472474 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 61811725 is about 7862.0433094711. The cubic root of 61811725 is about 395.3881246216.

Subtracting from 61811725 its reverse (52711816), we obtain a palindrome (9099909).

The spelling of 61811725 in words is "sixty-one million, eight hundred eleven thousand, seven hundred twenty-five".