1370020657 has 2 divisors, whose sum is σ = 1370020658. Its totient is φ = 1370020656.

The previous prime is 1370020627. The next prime is 1370020681. The reversal of 1370020657 is 7560200731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1313410081 + 56610576 = 36241^2 + 7524^2 .

It is an emirp because it is prime and its reverse (7560200731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1370020657 - 2⁷ = 1370020529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1370020627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685010328 + 685010329.

It is an arithmetic number, because the mean of its divisors is an integer number (685010329).

Almost surely, 2^1370020657 is an apocalyptic number.

It is an amenable number.

1370020657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1370020657 is an equidigital number, since it uses as much as digits as its factorization.

1370020657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 1370020657 is about 37013.7900923426. The cubic root of 1370020657 is about 1110.6461235658.

The spelling of 1370020657 in words is "one billion, three hundred seventy million, twenty thousand, six hundred fifty-seven".