1351999997 has 2 divisors, whose sum is σ = 1351999998. Its totient is φ = 1351999996.

The previous prime is 1351999951. The next prime is 1352000011. The reversal of 1351999997 is 7999991531.

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., 1184323396 + 167676601 = 34414^2 + 12949^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351999997 - 2²⁰ = 1350951421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351999897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675999998 + 675999999.

It is an arithmetic number, because the mean of its divisors is an integer number (675999999).

Almost surely, 2^1351999997 is an apocalyptic number.

It is an amenable number.

1351999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351999997 is an equidigital number, since it uses as much as digits as its factorization.

1351999997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6200145, while the sum is 62.

The square root of 1351999997 is about 36769.5525809058. The cubic root of 1351999997 is about 1105.7549619179.

The spelling of 1351999997 in words is "one billion, three hundred fifty-one million, nine hundred ninety-nine thousand, nine hundred ninety-seven".