61481887 has 4 divisors (see below), whose sum is σ = 61800640. Its totient is φ = 61163136.

The previous prime is 61481881. The next prime is 61481923. The reversal of 61481887 is 78818416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61481887 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 (61481881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159087 + ... + 159472.

It is an arithmetic number, because the mean of its divisors is an integer number (15450160).

Almost surely, 2^61481887 is an apocalyptic number.

61481887 is a deficient number, since it is larger than the sum of its proper divisors (318753).

61481887 is a wasteful number, since it uses less digits than its factorization.

61481887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318752.

The product of its digits is 86016, while the sum is 43.

The square root of 61481887 is about 7841.0386429350. The cubic root of 61481887 is about 394.6835835929.

The spelling of 61481887 in words is "sixty-one million, four hundred eighty-one thousand, eight hundred eighty-seven".