381316251 has 4 divisors (see below), whose sum is σ = 508421672. Its totient is φ = 254210832.

The previous prime is 381316249. The next prime is 381316267. The reversal of 381316251 is 152613183.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 381316251 - 2¹ = 381316249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381316211) 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 in 3 ways as a sum of consecutive naturals, for example, 63552706 + ... + 63552711.

It is an arithmetic number, because the mean of its divisors is an integer number (127105418).

Almost surely, 2^381316251 is an apocalyptic number.

381316251 is a deficient number, since it is larger than the sum of its proper divisors (127105421).

381316251 is a wasteful number, since it uses less digits than its factorization.

381316251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127105420.

The product of its digits is 4320, while the sum is 30.

The square root of 381316251 is about 19527.3206303374. The cubic root of 381316251 is about 725.1509798922.

The spelling of 381316251 in words is "three hundred eighty-one million, three hundred sixteen thousand, two hundred fifty-one".