61440291 has 48 divisors (see below), whose sum is σ = 102316032. Its totient is φ = 35457840.

The previous prime is 61440289. The next prime is 61440293. The reversal of 61440291 is 19204416.

61440291 is a `hidden beast` number, since 614 + 40 + 2 + 9 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (61440289) and next prime (61440293).

It is not a de Polignac number, because 61440291 - 2¹ = 61440289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61440293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275406 + ... + 275628.

It is an arithmetic number, because the mean of its divisors is an integer number (2131584).

Almost surely, 2^61440291 is an apocalyptic number.

61440291 is a deficient number, since it is larger than the sum of its proper divisors (40875741).

61440291 is a wasteful number, since it uses less digits than its factorization.

61440291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 61440291 is about 7838.3857394236. The cubic root of 61440291 is about 394.5945548673.

The spelling of 61440291 in words is "sixty-one million, four hundred forty thousand, two hundred ninety-one".