1385708881 has 2 divisors, whose sum is σ = 1385708882. Its totient is φ = 1385708880.

The previous prime is 1385708861. The next prime is 1385708887. The reversal of 1385708881 is 1888075831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1307545600 + 78163281 = 36160^2 + 8841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385708881 - 2¹³ = 1385700689 is a prime.

It is a super-2 number, since 2×1385708881² = 3840378205764544322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1385708887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692854440 + 692854441.

It is an arithmetic number, because the mean of its divisors is an integer number (692854441).

Almost surely, 2^1385708881 is an apocalyptic number.

It is an amenable number.

1385708881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385708881 is an equidigital number, since it uses as much as digits as its factorization.

1385708881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 49.

The square root of 1385708881 is about 37225.1108930517. The cubic root of 1385708881 is about 1114.8694119351.

The spelling of 1385708881 in words is "one billion, three hundred eighty-five million, seven hundred eight thousand, eight hundred eighty-one".