11971015061 has 2 divisors, whose sum is σ = 11971015062. Its totient is φ = 11971015060.

The previous prime is 11971015013. The next prime is 11971015073. The reversal of 11971015061 is 16051017911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9238862161 + 2732152900 = 96119^2 + 52270^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971015061 - 2⁶ = 11971014997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11971015081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985507530 + 5985507531.

It is an arithmetic number, because the mean of its divisors is an integer number (5985507531).

Almost surely, 2^11971015061 is an apocalyptic number.

It is an amenable number.

11971015061 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971015061 is an equidigital number, since it uses as much as digits as its factorization.

11971015061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 32.

The spelling of 11971015061 in words is "eleven billion, nine hundred seventy-one million, fifteen thousand, sixty-one".