1551287781907 has 2 divisors, whose sum is σ = 1551287781908. Its totient is φ = 1551287781906.

The previous prime is 1551287781889. The next prime is 1551287781913. The reversal of 1551287781907 is 7091877821551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1551287781907 - 2¹⁵ = 1551287749139 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551287781917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775643890953 + 775643890954.

It is an arithmetic number, because the mean of its divisors is an integer number (775643890954).

Almost surely, 2^{1551287781907} is an apocalyptic number.

1551287781907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551287781907 is an equidigital number, since it uses as much as digits as its factorization.

1551287781907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9878400, while the sum is 61.

The spelling of 1551287781907 in words is "one trillion, five hundred fifty-one billion, two hundred eighty-seven million, seven hundred eighty-one thousand, nine hundred seven".