201251381 has 2 divisors, whose sum is σ = 201251382. Its totient is φ = 201251380.

The previous prime is 201251353. The next prime is 201251447. The reversal of 201251381 is 183152102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181306225 + 19945156 = 13465^2 + 4466^2 .

It is a cyclic number.

It is not a de Polignac number, because 201251381 - 2¹⁴ = 201234997 is a prime.

It is a super-2 number, since 2×201251381² = 81004236708814322, which contains 22 as substring.

It is equal to p_11144444 and since 201251381 and 11144444 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201251581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100625690 + 100625691.

It is an arithmetic number, because the mean of its divisors is an integer number (100625691).

Almost surely, 2^201251381 is an apocalyptic number.

It is an amenable number.

201251381 is a deficient number, since it is larger than the sum of its proper divisors (1).

201251381 is an equidigital number, since it uses as much as digits as its factorization.

201251381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 201251381 is about 14186.3096328820. The cubic root of 201251381 is about 586.0206993740.

The spelling of 201251381 in words is "two hundred one million, two hundred fifty-one thousand, three hundred eighty-one".