203120381 has 2 divisors, whose sum is σ = 203120382. Its totient is φ = 203120380.

The previous prime is 203120363. The next prime is 203120413. The reversal of 203120381 is 183021302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169885156 + 33235225 = 13034^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 203120381 - 2¹⁸ = 202858237 is a prime.

It is a super-2 number, since 2×203120381² = 82515778355170322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203120681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560190 + 101560191.

It is an arithmetic number, because the mean of its divisors is an integer number (101560191).

Almost surely, 2^203120381 is an apocalyptic number.

It is an amenable number.

203120381 is a deficient number, since it is larger than the sum of its proper divisors (1).

203120381 is an equidigital number, since it uses as much as digits as its factorization.

203120381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 203120381 is about 14252.0307675784. The cubic root of 203120381 is about 587.8292161775.

Adding to 203120381 its reverse (183021302), we get a palindrome (386141683).

The spelling of 203120381 in words is "two hundred three million, one hundred twenty thousand, three hundred eighty-one".