1551339997 has 2 divisors, whose sum is σ = 1551339998. Its totient is φ = 1551339996.

The previous prime is 1551339967. The next prime is 1551340013. The reversal of 1551339997 is 7999331551.

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., 1243197081 + 308142916 = 35259^2 + 17554^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551339997 - 2⁷ = 1551339869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551339967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775669998 + 775669999.

It is an arithmetic number, because the mean of its divisors is an integer number (775669999).

Almost surely, 2^1551339997 is an apocalyptic number.

It is an amenable number.

1551339997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551339997 is an equidigital number, since it uses as much as digits as its factorization.

1551339997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1148175, while the sum is 52.

The square root of 1551339997 is about 39387.0536724950. The cubic root of 1551339997 is about 1157.6279303858.

The spelling of 1551339997 in words is "one billion, five hundred fifty-one million, three hundred thirty-nine thousand, nine hundred ninety-seven".