381215951 has 2 divisors, whose sum is σ = 381215952. Its totient is φ = 381215950.

The previous prime is 381215927. The next prime is 381215953. The reversal of 381215951 is 159512183.

It is a strong prime.

It is an emirp because it is prime and its reverse (159512183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381215951 - 2¹⁰ = 381214927 is a prime.

Together with 381215953, 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 (381215953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190607975 + 190607976.

It is an arithmetic number, because the mean of its divisors is an integer number (190607976).

Almost surely, 2^381215951 is an apocalyptic number.

381215951 is a deficient number, since it is larger than the sum of its proper divisors (1).

381215951 is an equidigital number, since it uses as much as digits as its factorization.

381215951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 35.

The square root of 381215951 is about 19524.7522647536. The cubic root of 381215951 is about 725.0873939832.

The spelling of 381215951 in words is "three hundred eighty-one million, two hundred fifteen thousand, nine hundred fifty-one".