61281562987 has 2 divisors, whose sum is σ = 61281562988. Its totient is φ = 61281562986.

The previous prime is 61281562949. The next prime is 61281563017. The reversal of 61281562987 is 78926518216.

It is a happy number.

61281562987 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 61281562987 - 2²³ = 61273174379 is a prime.

It is not a weakly prime, because it can be changed into another prime (61281568987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640781493 + 30640781494.

It is an arithmetic number, because the mean of its divisors is an integer number (30640781494).

Almost surely, 2^61281562987 is an apocalyptic number.

61281562987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281562987 is an equidigital number, since it uses as much as digits as its factorization.

61281562987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The spelling of 61281562987 in words is "sixty-one billion, two hundred eighty-one million, five hundred sixty-two thousand, nine hundred eighty-seven".