1378025617 has 2 divisors, whose sum is σ = 1378025618. Its totient is φ = 1378025616.

The previous prime is 1378025543. The next prime is 1378025629. The reversal of 1378025617 is 7165208731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1150498561 + 227527056 = 33919^2 + 15084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378025617 is a prime.

It is a super-2 number, since 2×1378025617² = 3797909202216461378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1378025617.

It is not a weakly prime, because it can be changed into another prime (1378025017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689012808 + 689012809.

It is an arithmetic number, because the mean of its divisors is an integer number (689012809).

Almost surely, 2^1378025617 is an apocalyptic number.

It is an amenable number.

1378025617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378025617 is an equidigital number, since it uses as much as digits as its factorization.

1378025617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 1378025617 is about 37121.7674282893. The cubic root of 1378025617 is about 1112.8050734607.

The spelling of 1378025617 in words is "one billion, three hundred seventy-eight million, twenty-five thousand, six hundred seventeen".