87731266051309 has 2 divisors, whose sum is σ = 87731266051310. Its totient is φ = 87731266051308.

The previous prime is 87731266051291. The next prime is 87731266051313. The reversal of 87731266051309 is 90315066213778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64913476472100 + 22817789579209 = 8056890^2 + 4776797^2 .

It is a cyclic number.

It is not a de Polignac number, because 87731266051309 - 2²⁷ = 87731131833581 is a prime.

It is a super-2 number, since 2×87731266051309² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87731266051409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43865633025654 + 43865633025655.

It is an arithmetic number, because the mean of its divisors is an integer number (43865633025655).

Almost surely, 2^{87731266051309} is an apocalyptic number.

It is an amenable number.

87731266051309 is a deficient number, since it is larger than the sum of its proper divisors (1).

87731266051309 is an equidigital number, since it uses as much as digits as its factorization.

87731266051309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 87731266051309 in words is "eighty-seven trillion, seven hundred thirty-one billion, two hundred sixty-six million, fifty-one thousand, three hundred nine".