47122981 has 4 divisors (see below), whose sum is σ = 48272364. Its totient is φ = 45973600.

The previous prime is 47122979. The next prime is 47122993. The reversal of 47122981 is 18922174.

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 18404100 + 28718881 = 4290^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 47122981 - 2¹ = 47122979 is a prime.

It is a super-2 number, since 2×47122981² = 4441150676652722, 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 (47122961) 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, 574630 + ... + 574711.

It is an arithmetic number, because the mean of its divisors is an integer number (12068091).

Almost surely, 2^47122981 is an apocalyptic number.

47122981 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

47122981 is a deficient number, since it is larger than the sum of its proper divisors (1149383).

47122981 is a wasteful number, since it uses less digits than its factorization.

47122981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149382.

The product of its digits is 8064, while the sum is 34.

The square root of 47122981 is about 6864.6180520113. The cubic root of 47122981 is about 361.1970977317.

The spelling of 47122981 in words is "forty-seven million, one hundred twenty-two thousand, nine hundred eighty-one".