381449251 has 2 divisors, whose sum is σ = 381449252. Its totient is φ = 381449250.

The previous prime is 381449239. The next prime is 381449261. The reversal of 381449251 is 152944183.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381449251 is a prime.

It is a super-2 number, since 2×381449251² = 291007062176922002, which contains 22 as substring.

It is equal to p_20398915 and since 381449251 and 20398915 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381449251.

It is not a weakly prime, because it can be changed into another prime (381449231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190724625 + 190724626.

It is an arithmetic number, because the mean of its divisors is an integer number (190724626).

Almost surely, 2^381449251 is an apocalyptic number.

381449251 is a deficient number, since it is larger than the sum of its proper divisors (1).

381449251 is an equidigital number, since it uses as much as digits as its factorization.

381449251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 381449251 is about 19530.7258185660. The cubic root of 381449251 is about 725.2352790089.

The spelling of 381449251 in words is "three hundred eighty-one million, four hundred forty-nine thousand, two hundred fifty-one".