61641513 has 8 divisors (see below), whose sum is σ = 91320800. Its totient is φ = 41094324.

The previous prime is 61641499. The next prime is 61641521. The reversal of 61641513 is 31514616.

61641513 is a `hidden beast` number, since 6 + 1 + 641 + 5 + 13 = 666.

61641513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61641513 - 2⁸ = 61641257 is a prime.

It is a super-2 number, since 2×61641513² = 7599352249858338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2283019 = 61641513 / (6 + 1 + 6 + 4 + 1 + 5 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61641553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141483 + ... + 1141536.

It is an arithmetic number, because the mean of its divisors is an integer number (11415100).

Almost surely, 2^61641513 is an apocalyptic number.

It is an amenable number.

61641513 is a deficient number, since it is larger than the sum of its proper divisors (29679287).

61641513 is a wasteful number, since it uses less digits than its factorization.

61641513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283028 (or 2283022 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 61641513 is about 7851.2109257108. The cubic root of 61641513 is about 395.0248619719.

The spelling of 61641513 in words is "sixty-one million, six hundred forty-one thousand, five hundred thirteen".