61091140 has 24 divisors (see below), whose sum is σ = 139954752. Its totient is φ = 22214880.

The previous prime is 61091131. The next prime is 61091143. The reversal of 61091140 is 4119016.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (61091143) 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 7 ways as a sum of consecutive naturals, for example, 138624 + ... + 139063.

It is an arithmetic number, because the mean of its divisors is an integer number (5831448).

Almost surely, 2^61091140 is an apocalyptic number.

It is an amenable number.

61091140 is an abundant number, since it is smaller than the sum of its proper divisors (78863612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61091140 is a wasteful number, since it uses less digits than its factorization.

61091140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277707 (or 277705 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 61091140 is about 7816.0821387700. The cubic root of 61091140 is about 393.8456712179.

The spelling of 61091140 in words is "sixty-one million, ninety-one thousand, one hundred forty".