1864724881 has 2 divisors, whose sum is σ = 1864724882. Its totient is φ = 1864724880.

The previous prime is 1864724867. The next prime is 1864724887. The reversal of 1864724881 is 1884274681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990990400 + 873734481 = 31480^2 + 29559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1864724881 is a prime.

It is a super-2 number, since 2×1864724881² = 6954397763640928322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1864724887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932362440 + 932362441.

It is an arithmetic number, because the mean of its divisors is an integer number (932362441).

Almost surely, 2^1864724881 is an apocalyptic number.

It is an amenable number.

1864724881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864724881 is an equidigital number, since it uses as much as digits as its factorization.

1864724881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688128, while the sum is 49.

The square root of 1864724881 is about 43182.4603398185. The cubic root of 1864724881 is about 1230.8494101969.

The spelling of 1864724881 in words is "one billion, eight hundred sixty-four million, seven hundred twenty-four thousand, eight hundred eighty-one".