61189487 has 4 divisors (see below), whose sum is σ = 61456920. Its totient is φ = 60922056.

The previous prime is 61189483. The next prime is 61189523. The reversal of 61189487 is 78498116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61189487 - 2² = 61189483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61189483) 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 3 ways as a sum of consecutive naturals, for example, 133373 + ... + 133830.

It is an arithmetic number, because the mean of its divisors is an integer number (15364230).

Almost surely, 2^61189487 is an apocalyptic number.

61189487 is a deficient number, since it is larger than the sum of its proper divisors (267433).

61189487 is a wasteful number, since it uses less digits than its factorization.

61189487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267432.

The product of its digits is 96768, while the sum is 44.

The square root of 61189487 is about 7822.3709321407. The cubic root of 61189487 is about 394.0569008324.

The spelling of 61189487 in words is "sixty-one million, one hundred eighty-nine thousand, four hundred eighty-seven".