1357329781 has 2 divisors, whose sum is σ = 1357329782. Its totient is φ = 1357329780.

The previous prime is 1357329773. The next prime is 1357329811. The reversal of 1357329781 is 1879237531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1270280881 + 87048900 = 35641^2 + 9330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1357329781 - 2³ = 1357329773 is a prime.

It is a super-2 number, since 2×1357329781² = 3684688268779015922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1357329881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678664890 + 678664891.

It is an arithmetic number, because the mean of its divisors is an integer number (678664891).

Almost surely, 2^1357329781 is an apocalyptic number.

It is an amenable number.

1357329781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1357329781 is an equidigital number, since it uses as much as digits as its factorization.

1357329781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 1357329781 is about 36841.9568019941. The cubic root of 1357329781 is about 1107.2060733007.

The spelling of 1357329781 in words is "one billion, three hundred fifty-seven million, three hundred twenty-nine thousand, seven hundred eighty-one".