5211747981 has 16 divisors (see below), whose sum is σ = 8423027520. Its totient is φ = 3158634960.

The previous prime is 5211747943. The next prime is 5211748019. The reversal of 5211747981 is 1897471125.

It is a happy number.

5211747981 is a `hidden beast` number, since 521 + 1 + 7 + 47 + 9 + 81 = 666.

It is an interprime number because it is at equal distance from previous prime (5211747943) and next prime (5211748019).

It is not a de Polignac number, because 5211747981 - 2⁹ = 5211747469 is a prime.

It is a super-2 number, since 2×5211747981² = 54324634034915152722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5211747581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8773690 + ... + 8774283.

It is an arithmetic number, because the mean of its divisors is an integer number (526439220).

Almost surely, 2^5211747981 is an apocalyptic number.

It is an amenable number.

5211747981 is a deficient number, since it is larger than the sum of its proper divisors (3211279539).

5211747981 is a wasteful number, since it uses less digits than its factorization.

5211747981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17547993 (or 17547987 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The square root of 5211747981 is about 72192.4371454517. The cubic root of 5211747981 is about 1733.7819166350.

The spelling of 5211747981 in words is "five billion, two hundred eleven million, seven hundred forty-seven thousand, nine hundred eighty-one".