1351999897 has 2 divisors, whose sum is σ = 1351999898. Its totient is φ = 1351999896.

The previous prime is 1351999889. The next prime is 1351999951. The reversal of 1351999897 is 7989991531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1337438041 + 14561856 = 36571^2 + 3816^2 .

It is an emirp because it is prime and its reverse (7989991531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1351999897 - 2³ = 1351999889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1351999877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675999948 + 675999949.

It is an arithmetic number, because the mean of its divisors is an integer number (675999949).

Almost surely, 2^1351999897 is an apocalyptic number.

It is an amenable number.

1351999897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351999897 is an equidigital number, since it uses as much as digits as its factorization.

1351999897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5511240, while the sum is 61.

The square root of 1351999897 is about 36769.5512210851. The cubic root of 1351999897 is about 1105.7549346557.

The spelling of 1351999897 in words is "one billion, three hundred fifty-one million, nine hundred ninety-nine thousand, eight hundred ninety-seven".