53469981 has 12 divisors (see below), whose sum is σ = 81777852. Its totient is φ = 33549696.

The previous prime is 53469979. The next prime is 53470003. The reversal of 53469981 is 18996435.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49702500 + 3767481 = 7050^2 + 1941^2 .

It is not a de Polignac number, because 53469981 - 2¹ = 53469979 is a prime.

It is a super-2 number, since 2×53469981² = 5718077736280722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53469901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174586 + ... + 174891.

It is an arithmetic number, because the mean of its divisors is an integer number (6814821).

Almost surely, 2^53469981 is an apocalyptic number.

53469981 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

53469981 is a deficient number, since it is larger than the sum of its proper divisors (28307871).

53469981 is a wasteful number, since it uses less digits than its factorization.

53469981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349500 (or 349497 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 53469981 is about 7312.3170746351. The cubic root of 53469981 is about 376.7356133307.

The spelling of 53469981 in words is "fifty-three million, four hundred sixty-nine thousand, nine hundred eighty-one".