285072421 has 2 divisors, whose sum is σ = 285072422. Its totient is φ = 285072420.

The previous prime is 285072401. The next prime is 285072433. The reversal of 285072421 is 124270582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156000100 + 129072321 = 12490^2 + 11361^2 .

It is a cyclic number.

It is not a de Polignac number, because 285072421 - 2¹⁹ = 284548133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285072401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142536210 + 142536211.

It is an arithmetic number, because the mean of its divisors is an integer number (142536211).

Almost surely, 2^285072421 is an apocalyptic number.

It is an amenable number.

285072421 is a deficient number, since it is larger than the sum of its proper divisors (1).

285072421 is an equidigital number, since it uses as much as digits as its factorization.

285072421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 285072421 is about 16884.0878047942. The cubic root of 285072421 is about 658.1401734793.

The spelling of 285072421 in words is "two hundred eighty-five million, seventy-two thousand, four hundred twenty-one".