381745157 has 4 divisors (see below), whose sum is σ = 384531756. Its totient is φ = 378958560.

The previous prime is 381745153. The next prime is 381745159. The reversal of 381745157 is 751547183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751547183 = 16657 ⋅45119.

It can be written as a sum of positive squares in 2 ways, for example, as 332661121 + 49084036 = 18239^2 + 7006^2 .

It is a cyclic number.

It is not a de Polignac number, because 381745157 - 2² = 381745153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381745151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393094 + ... + 1393367.

It is an arithmetic number, because the mean of its divisors is an integer number (96132939).

Almost surely, 2^381745157 is an apocalyptic number.

It is an amenable number.

381745157 is a deficient number, since it is larger than the sum of its proper divisors (2786599).

381745157 is a wasteful number, since it uses less digits than its factorization.

381745157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786598.

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

The square root of 381745157 is about 19538.2997469074. The cubic root of 381745157 is about 725.4227622299.

The spelling of 381745157 in words is "three hundred eighty-one million, seven hundred forty-five thousand, one hundred fifty-seven".