711551021 has 2 divisors, whose sum is σ = 711551022. Its totient is φ = 711551020.

The previous prime is 711551003. The next prime is 711551041. The reversal of 711551021 is 120155117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578402500 + 133148521 = 24050^2 + 11539^2 .

It is an emirp because it is prime and its reverse (120155117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 711551021 - 2²² = 707356717 is a prime.

It is a super-2 number, since 2×711551021² = 1012609710972284882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (711551041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355775510 + 355775511.

It is an arithmetic number, because the mean of its divisors is an integer number (355775511).

Almost surely, 2^711551021 is an apocalyptic number.

It is an amenable number.

711551021 is a deficient number, since it is larger than the sum of its proper divisors (1).

711551021 is an equidigital number, since it uses as much as digits as its factorization.

711551021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 711551021 is about 26674.9137018285. The cubic root of 711551021 is about 892.7612851946.

The spelling of 711551021 in words is "seven hundred eleven million, five hundred fifty-one thousand, twenty-one".