201985251 has 12 divisors (see below), whose sum is σ = 291624408. Its totient is φ = 124298304.

The previous prime is 201985207. The next prime is 201985297. The reversal of 201985251 is 152589102.

It is not a de Polignac number, because 201985251 - 2⁶ = 201985187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201985051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198690 + ... + 199703.

It is an arithmetic number, because the mean of its divisors is an integer number (24302034).

Almost surely, 2^201985251 is an apocalyptic number.

201985251 is a deficient number, since it is larger than the sum of its proper divisors (89639157).

201985251 is a wasteful number, since it uses less digits than its factorization.

201985251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398422 (or 398409 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 201985251 is about 14212.1515260709. The cubic root of 201985251 is about 586.7321500955.

The spelling of 201985251 in words is "two hundred one million, nine hundred eighty-five thousand, two hundred fifty-one".