1397069881 has 2 divisors, whose sum is σ = 1397069882. Its totient is φ = 1397069880.

The previous prime is 1397069837. The next prime is 1397069897. The reversal of 1397069881 is 1889607931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1298881600 + 98188281 = 36040^2 + 9909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397069881 - 2²¹ = 1394972729 is a prime.

It is a super-2 number, since 2×1397069881² = 3903608504794708322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1397069831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698534940 + 698534941.

It is an arithmetic number, because the mean of its divisors is an integer number (698534941).

Almost surely, 2^1397069881 is an apocalyptic number.

It is an amenable number.

1397069881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397069881 is an equidigital number, since it uses as much as digits as its factorization.

1397069881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1397069881 is about 37377.3979966503. The cubic root of 1397069881 is about 1117.9079465577.

The spelling of 1397069881 in words is "one billion, three hundred ninety-seven million, sixty-nine thousand, eight hundred eighty-one".