61987 has 2 divisors, whose sum is σ = 61988. Its totient is φ = 61986.

The previous prime is 61981. The next prime is 61991. The reversal of 61987 is 78916.

61987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61987 - 2³ = 61979 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (61981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30993 + 30994.

It is an arithmetic number, because the mean of its divisors is an integer number (30994).

2⁶¹⁹⁸⁷ is an apocalyptic number.

61987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61987 is an equidigital number, since it uses as much as digits as its factorization.

61987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 61987 is about 248.9718859631. The cubic root of 61987 is about 39.5761496351.

The spelling of 61987 in words is "sixty-one thousand, nine hundred eighty-seven".