381215953 has 2 divisors, whose sum is σ = 381215954. Its totient is φ = 381215952.

The previous prime is 381215951. The next prime is 381215963. The reversal of 381215953 is 359512183.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357323409 + 23892544 = 18903^2 + 4888^2 .

It is a cyclic number.

It is not a de Polignac number, because 381215953 - 2¹ = 381215951 is a prime.

Together with 381215951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (381215951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190607976 + 190607977.

It is an arithmetic number, because the mean of its divisors is an integer number (190607977).

Almost surely, 2^381215953 is an apocalyptic number.

It is an amenable number.

381215953 is a deficient number, since it is larger than the sum of its proper divisors (1).

381215953 is an equidigital number, since it uses as much as digits as its factorization.

381215953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 381215953 is about 19524.7523159706. The cubic root of 381215953 is about 725.0873952513.

The spelling of 381215953 in words is "three hundred eighty-one million, two hundred fifteen thousand, nine hundred fifty-three".