381557413 has 2 divisors, whose sum is σ = 381557414. Its totient is φ = 381557412.

The previous prime is 381557389. The next prime is 381557459. The reversal of 381557413 is 314755183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328588129 + 52969284 = 18127^2 + 7278^2 .

It is a cyclic number.

It is not a de Polignac number, because 381557413 - 2⁵ = 381557381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381557483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190778706 + 190778707.

It is an arithmetic number, because the mean of its divisors is an integer number (190778707).

Almost surely, 2^381557413 is an apocalyptic number.

It is an amenable number.

381557413 is a deficient number, since it is larger than the sum of its proper divisors (1).

381557413 is an equidigital number, since it uses as much as digits as its factorization.

381557413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 381557413 is about 19533.4946438163. The cubic root of 381557413 is about 725.3038206606.

The spelling of 381557413 in words is "three hundred eighty-one million, five hundred fifty-seven thousand, four hundred thirteen".