61181289 has 24 divisors (see below), whose sum is σ = 96794880. Its totient is φ = 37007712.

The previous prime is 61181221. The next prime is 61181293. The reversal of 61181289 is 98218116.

It is not a de Polignac number, because 61181289 - 2¹⁶ = 61115753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61181299) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2472 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (4033120).

Almost surely, 2^61181289 is an apocalyptic number.

It is an amenable number.

61181289 is a deficient number, since it is larger than the sum of its proper divisors (35613591).

61181289 is a wasteful number, since it uses less digits than its factorization.

61181289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8941 (or 8938 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 61181289 is about 7821.8469046639. The cubic root of 61181289 is about 394.0393018247.

The spelling of 61181289 in words is "sixty-one million, one hundred eighty-one thousand, two hundred eighty-nine".