1357207681 has 2 divisors, whose sum is σ = 1357207682. Its totient is φ = 1357207680.

The previous prime is 1357207679. The next prime is 1357207703. The reversal of 1357207681 is 1867027531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687226225 + 669981456 = 26215^2 + 25884^2 .

It is an emirp because it is prime and its reverse (1867027531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1357207681 - 2¹ = 1357207679 is a prime.

It is a super-2 number, since 2×1357207681² = 3684025378730795522, which contains 22 as substring.

Together with 1357207679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1357207651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678603840 + 678603841.

It is an arithmetic number, because the mean of its divisors is an integer number (678603841).

Almost surely, 2^1357207681 is an apocalyptic number.

It is an amenable number.

1357207681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1357207681 is an equidigital number, since it uses as much as digits as its factorization.

1357207681 is an evil number, because the sum of its binary digits is even.

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

The square root of 1357207681 is about 36840.2996866204. The cubic root of 1357207681 is about 1107.1728723505.

The spelling of 1357207681 in words is "one billion, three hundred fifty-seven million, two hundred seven thousand, six hundred eighty-one".