52021989 has 24 divisors (see below), whose sum is σ = 81513432. Its totient is φ = 31841280.

The previous prime is 52021979. The next prime is 52022017. The reversal of 52021989 is 98912025.

It can be written as a sum of positive squares in 4 ways, for example, as 613089 + 51408900 = 783^2 + 7170^2 .

It is not a de Polignac number, because 52021989 - 2⁸ = 52021733 is a prime.

It is a super-2 number, since 2×52021989² = 5412574679032242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52021979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2127 + ... + 10419.

It is an arithmetic number, because the mean of its divisors is an integer number (3396393).

Almost surely, 2^52021989 is an apocalyptic number.

It is an amenable number.

52021989 is a deficient number, since it is larger than the sum of its proper divisors (29491443).

52021989 is a wasteful number, since it uses less digits than its factorization.

52021989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8357 (or 8354 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 52021989 is about 7212.6270526071. The cubic root of 52021989 is about 373.3037199264.

Adding to 52021989 its sum of digits (36), we get a palindrome (52022025).

The spelling of 52021989 in words is "fifty-two million, twenty-one thousand, nine hundred eighty-nine".