1387357241 has 2 divisors, whose sum is σ = 1387357242. Its totient is φ = 1387357240.

The previous prime is 1387357207. The next prime is 1387357243. The reversal of 1387357241 is 1427537831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1361905216 + 25452025 = 36904^2 + 5045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387357241 is a prime.

It is a super-2 number, since 2×1387357241² = 3849520228310264162, which contains 22 as substring.

Together with 1387357243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1387357243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693678620 + 693678621.

It is an arithmetic number, because the mean of its divisors is an integer number (693678621).

Almost surely, 2^1387357241 is an apocalyptic number.

It is an amenable number.

1387357241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387357241 is an equidigital number, since it uses as much as digits as its factorization.

1387357241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 1387357241 is about 37247.2447437391. The cubic root of 1387357241 is about 1115.3112983885.

The spelling of 1387357241 in words is "one billion, three hundred eighty-seven million, three hundred fifty-seven thousand, two hundred forty-one".