1377973897 has 2 divisors, whose sum is σ = 1377973898. Its totient is φ = 1377973896.

The previous prime is 1377973843. The next prime is 1377973921. The reversal of 1377973897 is 7983797731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 937645641 + 440328256 = 30621^2 + 20984^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377973897 - 2¹¹ = 1377971849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1387973897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688986948 + 688986949.

It is an arithmetic number, because the mean of its divisors is an integer number (688986949).

Almost surely, 2^1377973897 is an apocalyptic number.

It is an amenable number.

1377973897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377973897 is an equidigital number, since it uses as much as digits as its factorization.

1377973897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14002632, while the sum is 61.

The square root of 1377973897 is about 37121.0707954391. The cubic root of 1377973897 is about 1112.7911513687.

The spelling of 1377973897 in words is "one billion, three hundred seventy-seven million, nine hundred seventy-three thousand, eight hundred ninety-seven".