342815981 has 2 divisors, whose sum is σ = 342815982. Its totient is φ = 342815980.

The previous prime is 342815969. The next prime is 342815983. The reversal of 342815981 is 189518243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333391081 + 9424900 = 18259^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 342815981 - 2²² = 338621677 is a prime.

It is a super-2 number, since 2×342815981² = 235045593657984722, which contains 22 as substring.

Together with 342815983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342815983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171407990 + 171407991.

It is an arithmetic number, because the mean of its divisors is an integer number (171407991).

Almost surely, 2^342815981 is an apocalyptic number.

It is an amenable number.

342815981 is a deficient number, since it is larger than the sum of its proper divisors (1).

342815981 is an equidigital number, since it uses as much as digits as its factorization.

342815981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 342815981 is about 18515.2904649103. The cubic root of 342815981 is about 699.8747946133.

The spelling of 342815981 in words is "three hundred forty-two million, eight hundred fifteen thousand, nine hundred eighty-one".