53409881 has 4 divisors (see below), whose sum is σ = 61039872. Its totient is φ = 45779892.

The previous prime is 53409871. The next prime is 53409883. The reversal of 53409881 is 18890435.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18890435 = 5 ⋅3778087.

It is a cyclic number.

It is not a de Polignac number, because 53409881 - 2¹⁰ = 53408857 is a prime.

It is a super-2 number, since 2×53409881² = 5705230776868322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53409883) 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, 3814985 + ... + 3814998.

It is an arithmetic number, because the mean of its divisors is an integer number (15259968).

Almost surely, 2^53409881 is an apocalyptic number.

It is an amenable number.

53409881 is a deficient number, since it is larger than the sum of its proper divisors (7629991).

53409881 is an equidigital number, since it uses as much as digits as its factorization.

53409881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7629990.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 53409881 is about 7308.2064147094. The cubic root of 53409881 is about 376.5944107448.

The spelling of 53409881 in words is "fifty-three million, four hundred nine thousand, eight hundred eighty-one".