1378245497 has 2 divisors, whose sum is σ = 1378245498. Its totient is φ = 1378245496.

The previous prime is 1378245433. The next prime is 1378245499. The reversal of 1378245497 is 7945428731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194670096 + 183575401 = 34564^2 + 13549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378245497 - 2⁶ = 1378245433 is a prime.

Together with 1378245499, 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 (1378245499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689122748 + 689122749.

It is an arithmetic number, because the mean of its divisors is an integer number (689122749).

Almost surely, 2^1378245497 is an apocalyptic number.

It is an amenable number.

1378245497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378245497 is an equidigital number, since it uses as much as digits as its factorization.

1378245497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 50.

The square root of 1378245497 is about 37124.7289148352. The cubic root of 1378245497 is about 1112.8642573065.

The spelling of 1378245497 in words is "one billion, three hundred seventy-eight million, two hundred forty-five thousand, four hundred ninety-seven".