61891413 has 24 divisors (see below), whose sum is σ = 87860640. Its totient is φ = 38739360.

The previous prime is 61891391. The next prime is 61891421. The reversal of 61891413 is 31419816.

61891413 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 61891413 - 2⁵ = 61891381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61891463) 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 23 ways as a sum of consecutive naturals, for example, 93303 + ... + 93963.

It is an arithmetic number, because the mean of its divisors is an integer number (3660860).

Almost surely, 2^61891413 is an apocalyptic number.

It is an amenable number.

61891413 is a deficient number, since it is larger than the sum of its proper divisors (25969227).

61891413 is a wasteful number, since it uses less digits than its factorization.

61891413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 746 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 61891413 is about 7867.1095708653. The cubic root of 61891413 is about 395.5579638046.

The spelling of 61891413 in words is "sixty-one million, eight hundred ninety-one thousand, four hundred thirteen".