981395381 has 2 divisors, whose sum is σ = 981395382. Its totient is φ = 981395380.

The previous prime is 981395369. The next prime is 981395411. The reversal of 981395381 is 183593189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686964100 + 294431281 = 26210^2 + 17159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981395381 is a prime.

It is a super-2 number, since 2×981395381² = 1926273787696270322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (984395381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490697690 + 490697691.

It is an arithmetic number, because the mean of its divisors is an integer number (490697691).

Almost surely, 2^981395381 is an apocalyptic number.

It is an amenable number.

981395381 is a deficient number, since it is larger than the sum of its proper divisors (1).

981395381 is an equidigital number, since it uses as much as digits as its factorization.

981395381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 981395381 is about 31327.2306627956. The cubic root of 981395381 is about 993.7595987312.

The spelling of 981395381 in words is "nine hundred eighty-one million, three hundred ninety-five thousand, three hundred eighty-one".