727556981 has 2 divisors, whose sum is σ = 727556982. Its totient is φ = 727556980.

The previous prime is 727556969. The next prime is 727556983. The reversal of 727556981 is 189655727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459416356 + 268140625 = 21434^2 + 16375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-727556981 is a prime.

It is a super-2 number, since 2×727556981² = 1058678321203668722, which contains 22 as substring.

Together with 727556983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (727556983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363778490 + 363778491.

It is an arithmetic number, because the mean of its divisors is an integer number (363778491).

Almost surely, 2^727556981 is an apocalyptic number.

It is an amenable number.

727556981 is a deficient number, since it is larger than the sum of its proper divisors (1).

727556981 is an equidigital number, since it uses as much as digits as its factorization.

727556981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 50.

The square root of 727556981 is about 26973.2641888222. The cubic root of 727556981 is about 899.4057727669.

The spelling of 727556981 in words is "seven hundred twenty-seven million, five hundred fifty-six thousand, nine hundred eighty-one".