61561725 has 24 divisors (see below), whose sum is σ = 102201792. Its totient is φ = 32697600.

The previous prime is 61561663. The next prime is 61561727. The reversal of 61561725 is 52716516.

It is not a de Polignac number, because 61561725 - 2¹⁰ = 61560701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18165 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (4258408).

Almost surely, 2^61561725 is an apocalyptic number.

It is an amenable number.

61561725 is a deficient number, since it is larger than the sum of its proper divisors (40640067).

61561725 is a wasteful number, since it uses less digits than its factorization.

61561725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3392 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 61561725 is about 7846.1280259756. The cubic root of 61561725 is about 394.8543499751.

The spelling of 61561725 in words is "sixty-one million, five hundred sixty-one thousand, seven hundred twenty-five".