214781381 has 2 divisors, whose sum is σ = 214781382. Its totient is φ = 214781380.

The previous prime is 214781363. The next prime is 214781389. The reversal of 214781381 is 183187412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214358881 + 422500 = 14641^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 214781381 - 2¹⁴ = 214764997 is a prime.

It is a super-2 number, since 2×214781381² = 92262083248534322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (214781389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107390690 + 107390691.

It is an arithmetic number, because the mean of its divisors is an integer number (107390691).

Almost surely, 2^214781381 is an apocalyptic number.

It is an amenable number.

214781381 is a deficient number, since it is larger than the sum of its proper divisors (1).

214781381 is an equidigital number, since it uses as much as digits as its factorization.

214781381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 35.

The square root of 214781381 is about 14655.4215565435. The cubic root of 214781381 is about 598.8695204384.

The spelling of 214781381 in words is "two hundred fourteen million, seven hundred eighty-one thousand, three hundred eighty-one".