203738981 has 2 divisors, whose sum is σ = 203738982. Its totient is φ = 203738980.

The previous prime is 203738947. The next prime is 203738987. The reversal of 203738981 is 189837302.

203738981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162970756 + 40768225 = 12766^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 203738981 - 2¹⁰ = 203737957 is a prime.

It is a super-2 number, since 2×203738981² = 83019144757836722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203738987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101869490 + 101869491.

It is an arithmetic number, because the mean of its divisors is an integer number (101869491).

Almost surely, 2^203738981 is an apocalyptic number.

It is an amenable number.

203738981 is a deficient number, since it is larger than the sum of its proper divisors (1).

203738981 is an equidigital number, since it uses as much as digits as its factorization.

203738981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 203738981 is about 14273.7164396663. The cubic root of 203738981 is about 588.4253530271.

The spelling of 203738981 in words is "two hundred three million, seven hundred thirty-eight thousand, nine hundred eighty-one".