61863887 has 2 divisors, whose sum is σ = 61863888. Its totient is φ = 61863886.

The previous prime is 61863883. The next prime is 61863899. The reversal of 61863887 is 78836816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61863887 - 2² = 61863883 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61863881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30931943 + 30931944.

It is an arithmetic number, because the mean of its divisors is an integer number (30931944).

Almost surely, 2^61863887 is an apocalyptic number.

61863887 is a deficient number, since it is larger than the sum of its proper divisors (1).

61863887 is an equidigital number, since it uses as much as digits as its factorization.

61863887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 61863887 is about 7865.3599409054. The cubic root of 61863887 is about 395.4993140795.

The spelling of 61863887 in words is "sixty-one million, eight hundred sixty-three thousand, eight hundred eighty-seven".