53728531 has 2 divisors, whose sum is σ = 53728532. Its totient is φ = 53728530.

The previous prime is 53728489. The next prime is 53728537. The reversal of 53728531 is 13582735.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53728531 - 2⁹ = 53728019 is a prime.

It is a super-2 number, since 2×53728531² = 5773510086835922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (53728537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26864265 + 26864266.

It is an arithmetic number, because the mean of its divisors is an integer number (26864266).

Almost surely, 2^53728531 is an apocalyptic number.

53728531 is a deficient number, since it is larger than the sum of its proper divisors (1).

53728531 is an equidigital number, since it uses as much as digits as its factorization.

53728531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 53728531 is about 7329.9748294247. The cubic root of 53728531 is about 377.3418626272.

The spelling of 53728531 in words is "fifty-three million, seven hundred twenty-eight thousand, five hundred thirty-one".