1551097409 has 2 divisors, whose sum is σ = 1551097410. Its totient is φ = 1551097408.

The previous prime is 1551097399. The next prime is 1551097411. The reversal of 1551097409 is 9047901551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1294200625 + 256896784 = 35975^2 + 16028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551097409 is a prime.

It is a Sophie Germain prime.

Together with 1551097411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1551097489) 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, 775548704 + 775548705.

It is an arithmetic number, because the mean of its divisors is an integer number (775548705).

Almost surely, 2^1551097409 is an apocalyptic number.

It is an amenable number.

1551097409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551097409 is an equidigital number, since it uses as much as digits as its factorization.

1551097409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 41.

The square root of 1551097409 is about 39383.9740122807. The cubic root of 1551097409 is about 1157.5675865789.

The spelling of 1551097409 in words is "one billion, five hundred fifty-one million, ninety-seven thousand, four hundred nine".