61811487 has 12 divisors (see below), whose sum is σ = 89355240. Its totient is φ = 41174448.

The previous prime is 61811471. The next prime is 61811537. The reversal of 61811487 is 78411816.

It is not a de Polignac number, because 61811487 - 2⁴ = 61811471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61811437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15064 + ... + 18722.

It is an arithmetic number, because the mean of its divisors is an integer number (7446270).

Almost surely, 2^61811487 is an apocalyptic number.

61811487 is a deficient number, since it is larger than the sum of its proper divisors (27543753).

61811487 is a wasteful number, since it uses less digits than its factorization.

61811487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5542 (or 5539 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 61811487 is about 7862.0281734423. The cubic root of 61811487 is about 395.3876171532.

The spelling of 61811487 in words is "sixty-one million, eight hundred eleven thousand, four hundred eighty-seven".