711985381 has 4 divisors (see below), whose sum is σ = 753866892. Its totient is φ = 670103872.

The previous prime is 711985319. The next prime is 711985403. The reversal of 711985381 is 183589117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 493950625 + 218034756 = 22225^2 + 14766^2 .

It is a cyclic number.

It is not a de Polignac number, because 711985381 - 2²¹ = 709888229 is a prime.

It is a super-2 number, since 2×711985381² = 1013846365515430322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (711985181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20940730 + ... + 20940763.

It is an arithmetic number, because the mean of its divisors is an integer number (188466723).

Almost surely, 2^711985381 is an apocalyptic number.

It is an amenable number.

711985381 is a deficient number, since it is larger than the sum of its proper divisors (41881511).

711985381 is a wasteful number, since it uses less digits than its factorization.

711985381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41881510.

The product of its digits is 60480, while the sum is 43.

The square root of 711985381 is about 26683.0541917525. The cubic root of 711985381 is about 892.9429076417.

The spelling of 711985381 in words is "seven hundred eleven million, nine hundred eighty-five thousand, three hundred eighty-one".