61511814 has 144 divisors (see below), whose sum is σ = 177454368. Its totient is φ = 14943744.

The previous prime is 61511777. The next prime is 61511869. The reversal of 61511814 is 41811516.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1308739 + ... + 1308785.

It is an arithmetic number, because the mean of its divisors is an integer number (1232322).

Almost surely, 2^61511814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61511814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88727184).

61511814 is an abundant number, since it is smaller than the sum of its proper divisors (115942554).

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

61511814 is a wasteful number, since it uses less digits than its factorization.

61511814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 89 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 61511814 is about 7842.9467676378. The cubic root of 61511814 is about 394.7476120963.

The spelling of 61511814 in words is "sixty-one million, five hundred eleven thousand, eight hundred fourteen".