736388981 has 2 divisors, whose sum is σ = 736388982. Its totient is φ = 736388980.

The previous prime is 736388977. The next prime is 736389007. The reversal of 736388981 is 189883637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438274225 + 298114756 = 20935^2 + 17266^2 .

It is an emirp because it is prime and its reverse (189883637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 736388981 - 2² = 736388977 is a prime.

It is a super-2 number, since 2×736388981² = 1084537462676436722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (736388951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 368194490 + 368194491.

It is an arithmetic number, because the mean of its divisors is an integer number (368194491).

Almost surely, 2^736388981 is an apocalyptic number.

It is an amenable number.

736388981 is a deficient number, since it is larger than the sum of its proper divisors (1).

736388981 is an equidigital number, since it uses as much as digits as its factorization.

736388981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 736388981 is about 27136.4880004764. The cubic root of 736388981 is about 903.0305169868.

The spelling of 736388981 in words is "seven hundred thirty-six million, three hundred eighty-eight thousand, nine hundred eighty-one".