61491822 has 64 divisors (see below), whose sum is σ = 151041024. Its totient is φ = 16289280.

The previous prime is 61491779. The next prime is 61491823. The reversal of 61491822 is 22819416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61491823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50088 + ... + 51300.

It is an arithmetic number, because the mean of its divisors is an integer number (2360016).

Almost surely, 2^61491822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61491822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75520512).

61491822 is an abundant number, since it is smaller than the sum of its proper divisors (89549202).

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

61491822 is a wasteful number, since it uses less digits than its factorization.

61491822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313.

The product of its digits is 6912, while the sum is 33.

The square root of 61491822 is about 7841.6721431083. The cubic root of 61491822 is about 394.7048417249.

The spelling of 61491822 in words is "sixty-one million, four hundred ninety-one thousand, eight hundred twenty-two".