53551391 has 2 divisors, whose sum is σ = 53551392. Its totient is φ = 53551390.

The previous prime is 53551387. The next prime is 53551403. The reversal of 53551391 is 19315535.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53551391 - 2² = 53551387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53551891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26775695 + 26775696.

It is an arithmetic number, because the mean of its divisors is an integer number (26775696).

Almost surely, 2^53551391 is an apocalyptic number.

53551391 is a deficient number, since it is larger than the sum of its proper divisors (1).

53551391 is an equidigital number, since it uses as much as digits as its factorization.

53551391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10125, while the sum is 32.

The square root of 53551391 is about 7317.8815923736. The cubic root of 53551391 is about 376.9267142901.

The spelling of 53551391 in words is "fifty-three million, five hundred fifty-one thousand, three hundred ninety-one".