52185421 has 2 divisors, whose sum is σ = 52185422. Its totient is φ = 52185420.

The previous prime is 52185409. The next prime is 52185451. The reversal of 52185421 is 12458125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50211396 + 1974025 = 7086^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 52185421 - 2⁷ = 52185293 is a prime.

It is equal to p_3124279 and since 52185421 and 3124279 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52185421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52185451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26092710 + 26092711.

It is an arithmetic number, because the mean of its divisors is an integer number (26092711).

Almost surely, 2^52185421 is an apocalyptic number.

It is an amenable number.

52185421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52185421 is an equidigital number, since it uses as much as digits as its factorization.

52185421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 28.

The square root of 52185421 is about 7223.9477434433. The cubic root of 52185421 is about 373.6942342498.

The spelling of 52185421 in words is "fifty-two million, one hundred eighty-five thousand, four hundred twenty-one".