381547157 has 2 divisors, whose sum is σ = 381547158. Its totient is φ = 381547156.

The previous prime is 381547147. The next prime is 381547181. The reversal of 381547157 is 751745183.

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., 281367076 + 100180081 = 16774^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 381547157 - 2⁴ = 381547141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381547147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190773578 + 190773579.

It is an arithmetic number, because the mean of its divisors is an integer number (190773579).

Almost surely, 2^381547157 is an apocalyptic number.

It is an amenable number.

381547157 is a deficient number, since it is larger than the sum of its proper divisors (1).

381547157 is an equidigital number, since it uses as much as digits as its factorization.

381547157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117600, while the sum is 41.

The square root of 381547157 is about 19533.2321186229. The cubic root of 381547157 is about 725.2973220470.

The spelling of 381547157 in words is "three hundred eighty-one million, five hundred forty-seven thousand, one hundred fifty-seven".