285215123 has 2 divisors, whose sum is σ = 285215124. Its totient is φ = 285215122.

The previous prime is 285215107. The next prime is 285215131. The reversal of 285215123 is 321512582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285215123 - 2⁴ = 285215107 is a prime.

It is not a weakly prime, because it can be changed into another prime (285215153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142607561 + 142607562.

It is an arithmetic number, because the mean of its divisors is an integer number (142607562).

Almost surely, 2^285215123 is an apocalyptic number.

285215123 is a deficient number, since it is larger than the sum of its proper divisors (1).

285215123 is an equidigital number, since it uses as much as digits as its factorization.

285215123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 285215123 is about 16888.3132076593. The cubic root of 285215123 is about 658.2499727739.

The spelling of 285215123 in words is "two hundred eighty-five million, two hundred fifteen thousand, one hundred twenty-three".