61259391 has 12 divisors (see below), whose sum is σ = 90544168. Its totient is φ = 39889584.

The previous prime is 61259389. The next prime is 61259459. The reversal of 61259391 is 19395216.

61259391 is a `hidden beast` number, since 61 + 2 + 593 + 9 + 1 = 666.

It is not a de Polignac number, because 61259391 - 2¹ = 61259389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61259321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78760 + ... + 79533.

Almost surely, 2^61259391 is an apocalyptic number.

61259391 is a deficient number, since it is larger than the sum of its proper divisors (29284777).

61259391 is a wasteful number, since it uses less digits than its factorization.

61259391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158342 (or 158339 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 61259391 is about 7826.8378672360. The cubic root of 61259391 is about 394.2069030188.

It can be divided in two parts, 61 and 259391, that multiplied together give a palindrome (15822851).

The spelling of 61259391 in words is "sixty-one million, two hundred fifty-nine thousand, three hundred ninety-one".