61512649 has 27 divisors (see below), whose sum is σ = 73034157. Its totient is φ = 51763800.

The previous prime is 61512623. The next prime is 61512653. The reversal of 61512649 is 94621516.

The square root of 61512649 is 7843.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-61512649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61512149) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1984264 + ... + 1984294.

Almost surely, 2^61512649 is an apocalyptic number.

61512649 is the 7843-rd square number.

61512649 is the 3922-nd centered octagonal number.

It is an amenable number.

61512649 is a deficient number, since it is larger than the sum of its proper divisors (11521508).

61512649 is a wasteful number, since it uses less digits than its factorization.

61512649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 65 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The cubic root of 61512649 is about 394.7493982723.

The spelling of 61512649 in words is "sixty-one million, five hundred twelve thousand, six hundred forty-nine".