53515391 has 2 divisors, whose sum is σ = 53515392. Its totient is φ = 53515390.

The previous prime is 53515369. The next prime is 53515447. The reversal of 53515391 is 19351535.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53515391 - 2¹⁴ = 53499007 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 (53512391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26757695 + 26757696.

It is an arithmetic number, because the mean of its divisors is an integer number (26757696).

Almost surely, 2^53515391 is an apocalyptic number.

53515391 is a deficient number, since it is larger than the sum of its proper divisors (1).

53515391 is an equidigital number, since it uses as much as digits as its factorization.

53515391 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 53515391 is about 7315.4214506069. The cubic root of 53515391 is about 376.8422321801.

The spelling of 53515391 in words is "fifty-three million, five hundred fifteen thousand, three hundred ninety-one".