61681325 has 6 divisors (see below), whose sum is σ = 76484874. Its totient is φ = 49345040.

The previous prime is 61681313. The next prime is 61681337. The reversal of 61681325 is 52318616.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61681313) and next prime (61681337).

It can be written as a sum of positive squares in 3 ways, for example, as 8128201 + 53553124 = 2851^2 + 7318^2 .

It is not a de Polignac number, because 61681325 - 2¹⁶ = 61615789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61681291 and 61681300.

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, 1233602 + ... + 1233651.

It is an arithmetic number, because the mean of its divisors is an integer number (12747479).

Almost surely, 2^61681325 is an apocalyptic number.

It is an amenable number.

61681325 is a deficient number, since it is larger than the sum of its proper divisors (14803549).

61681325 is a wasteful number, since it uses less digits than its factorization.

61681325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467263 (or 2467258 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 61681325 is about 7853.7459215332. The cubic root of 61681325 is about 395.1098877091.

The spelling of 61681325 in words is "sixty-one million, six hundred eighty-one thousand, three hundred twenty-five".