745919981 has 2 divisors, whose sum is σ = 745919982. Its totient is φ = 745919980.

The previous prime is 745919971. The next prime is 745920023. The reversal of 745919981 is 189919547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 683351881 + 62568100 = 26141^2 + 7910^2 .

It is a cyclic number.

It is not a de Polignac number, because 745919981 - 2¹⁴ = 745903597 is a prime.

It is a super-2 number, since 2×745919981² = 1112793236110080722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745919971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372959990 + 372959991.

It is an arithmetic number, because the mean of its divisors is an integer number (372959991).

Almost surely, 2^745919981 is an apocalyptic number.

It is an amenable number.

745919981 is a deficient number, since it is larger than the sum of its proper divisors (1).

745919981 is an equidigital number, since it uses as much as digits as its factorization.

745919981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 53.

The square root of 745919981 is about 27311.5356763401. The cubic root of 745919981 is about 906.9097694754.

The spelling of 745919981 in words is "seven hundred forty-five million, nine hundred nineteen thousand, nine hundred eighty-one".