987731859449 has 2 divisors, whose sum is σ = 987731859450. Its totient is φ = 987731859448.

The previous prime is 987731859407. The next prime is 987731859473. The reversal of 987731859449 is 944958137789.

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., 954200756224 + 33531103225 = 976832^2 + 183115^2 .

It is a cyclic number.

It is not a de Polignac number, because 987731859449 - 2²⁰ = 987730810873 is a prime.

It is a super-2 number, since 2×987731859449² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (987731859949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493865929724 + 493865929725.

It is an arithmetic number, because the mean of its divisors is an integer number (493865929725).

Almost surely, 2^987731859449 is an apocalyptic number.

It is an amenable number.

987731859449 is a deficient number, since it is larger than the sum of its proper divisors (1).

987731859449 is an equidigital number, since it uses as much as digits as its factorization.

987731859449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 548674560, while the sum is 74.

The spelling of 987731859449 in words is "nine hundred eighty-seven billion, seven hundred thirty-one million, eight hundred fifty-nine thousand, four hundred forty-nine".