61867859 has 2 divisors, whose sum is σ = 61867860. Its totient is φ = 61867858.

The previous prime is 61867849. The next prime is 61867873. The reversal of 61867859 is 95876816.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61867859 - 2⁴ = 61867843 is a prime.

It is not a weakly prime, because it can be changed into another prime (61867849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30933929 + 30933930.

It is an arithmetic number, because the mean of its divisors is an integer number (30933930).

Almost surely, 2^61867859 is an apocalyptic number.

61867859 is a deficient number, since it is larger than the sum of its proper divisors (1).

61867859 is an equidigital number, since it uses as much as digits as its factorization.

61867859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 61867859 is about 7865.6124364222. The cubic root of 61867859 is about 395.5077783049.

It can be divided in two parts, 61867 and 859, that added together give a palindrome (62726).

The spelling of 61867859 in words is "sixty-one million, eight hundred sixty-seven thousand, eight hundred fifty-nine".