1383156857 has 2 divisors, whose sum is σ = 1383156858. Its totient is φ = 1383156856.

The previous prime is 1383156823. The next prime is 1383156881. The reversal of 1383156857 is 7586513831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1209022441 + 174134416 = 34771^2 + 13196^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383156857 - 2¹⁰ = 1383155833 is a prime.

It is a super-2 number, since 2×1383156857² = 3826245782132236898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1383156157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691578428 + 691578429.

It is an arithmetic number, because the mean of its divisors is an integer number (691578429).

Almost surely, 2^1383156857 is an apocalyptic number.

It is an amenable number.

1383156857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383156857 is an equidigital number, since it uses as much as digits as its factorization.

1383156857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 47.

The square root of 1383156857 is about 37190.8168369559. The cubic root of 1383156857 is about 1114.1845826871.

The spelling of 1383156857 in words is "one billion, three hundred eighty-three million, one hundred fifty-six thousand, eight hundred fifty-seven".