61513525 has 12 divisors (see below), whose sum is σ = 76414752. Its totient is φ = 49121840.

The previous prime is 61513513. The next prime is 61513537. The reversal of 61513525 is 52531516.

It is an interprime number because it is at equal distance from previous prime (61513513) and next prime (61513537).

It is not a de Polignac number, because 61513525 - 2⁵ = 61513493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61513493 and 61513502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14274 + ... + 18076.

It is an arithmetic number, because the mean of its divisors is an integer number (6367896).

Almost surely, 2^61513525 is an apocalyptic number.

It is an amenable number.

61513525 is a deficient number, since it is larger than the sum of its proper divisors (14901227).

61513525 is a wasteful number, since it uses less digits than its factorization.

61513525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460 (or 4455 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The square root of 61513525 is about 7843.0558457785. The cubic root of 61513525 is about 394.7512721353.

Subtracting from 61513525 its reverse (52531516), we obtain a square (8982009 = 2997²).

The spelling of 61513525 in words is "sixty-one million, five hundred thirteen thousand, five hundred twenty-five".