53815391 has 16 divisors (see below), whose sum is σ = 65049600. Its totient is φ = 43491168.

The previous prime is 53815369. The next prime is 53815393. The reversal of 53815391 is 19351835.

It is not a de Polignac number, because 53815391 - 2¹⁴ = 53799007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53815393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30941 + ... + 32633.

It is an arithmetic number, because the mean of its divisors is an integer number (4065600).

Almost surely, 2^53815391 is an apocalyptic number.

53815391 is a deficient number, since it is larger than the sum of its proper divisors (11234209).

53815391 is a wasteful number, since it uses less digits than its factorization.

53815391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958.

The product of its digits is 16200, while the sum is 35.

The square root of 53815391 is about 7335.8974229470. The cubic root of 53815391 is about 377.5450958509.

The spelling of 53815391 in words is "fifty-three million, eight hundred fifteen thousand, three hundred ninety-one".