61281863 has 2 divisors, whose sum is σ = 61281864. Its totient is φ = 61281862.

The previous prime is 61281853. The next prime is 61281877. The reversal of 61281863 is 36818216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61281863 - 2¹² = 61277767 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 (61281853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640931 + 30640932.

It is an arithmetic number, because the mean of its divisors is an integer number (30640932).

Almost surely, 2^61281863 is an apocalyptic number.

61281863 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281863 is an equidigital number, since it uses as much as digits as its factorization.

61281863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 61281863 is about 7828.2733089743. The cubic root of 61281863 is about 394.2550998987.

The spelling of 61281863 in words is "sixty-one million, two hundred eighty-one thousand, eight hundred sixty-three".