971785511959 has 2 divisors, whose sum is σ = 971785511960. Its totient is φ = 971785511958.

The previous prime is 971785511953. The next prime is 971785511981. The reversal of 971785511959 is 959115587179.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 971785511959 - 2¹¹ = 971785509911 is a prime.

It is a super-4 number, since 4×971785511959⁴ (a number of 49 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 971785511894 and 971785511903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971785511953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485892755979 + 485892755980.

It is an arithmetic number, because the mean of its divisors is an integer number (485892755980).

Almost surely, 2^971785511959 is an apocalyptic number.

971785511959 is a deficient number, since it is larger than the sum of its proper divisors (1).

971785511959 is an equidigital number, since it uses as much as digits as its factorization.

971785511959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721000, while the sum is 67.

The spelling of 971785511959 in words is "nine hundred seventy-one billion, seven hundred eighty-five million, five hundred eleven thousand, nine hundred fifty-nine".