61330725 has 18 divisors (see below), whose sum is σ = 109850546. Its totient is φ = 32709600.

The previous prime is 61330721. The next prime is 61330729. The reversal of 61330725 is 52703316.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61330721) and next prime (61330729).

It can be written as a sum of positive squares in 3 ways, for example, as 6066369 + 55264356 = 2463^2 + 7434^2 .

It is not a de Polignac number, because 61330725 - 2² = 61330721 is a prime.

It is a super-2 number, since 2×61330725² = 7522915658051250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61330721) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 136066 + ... + 136515.

Almost surely, 2^61330725 is an apocalyptic number.

It is an amenable number.

61330725 is a deficient number, since it is larger than the sum of its proper divisors (48519821).

61330725 is a wasteful number, since it uses less digits than its factorization.

61330725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272597 (or 272589 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 61330725 is about 7831.3935541511. The cubic root of 61330725 is about 394.3598561515.

The spelling of 61330725 in words is "sixty-one million, three hundred thirty thousand, seven hundred twenty-five".