1287040435957 has 2 divisors, whose sum is σ = 1287040435958. Its totient is φ = 1287040435956.

The previous prime is 1287040435949. The next prime is 1287040435979. The reversal of 1287040435957 is 7595340407821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1261378318321 + 25662117636 = 1123111^2 + 160194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287040435957 - 2³ = 1287040435949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287040435898 and 1287040435907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287040435987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643520217978 + 643520217979.

It is an arithmetic number, because the mean of its divisors is an integer number (643520217979).

Almost surely, 2^{1287040435957} is an apocalyptic number.

It is an amenable number.

1287040435957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287040435957 is an equidigital number, since it uses as much as digits as its factorization.

1287040435957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 55.

The spelling of 1287040435957 in words is "one trillion, two hundred eighty-seven billion, forty million, four hundred thirty-five thousand, nine hundred fifty-seven".