11920601081 has 2 divisors, whose sum is σ = 11920601082. Its totient is φ = 11920601080.

The previous prime is 11920601057. The next prime is 11920601087. The reversal of 11920601081 is 18010602911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9728863225 + 2191737856 = 98635^2 + 46816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11920601081 is a prime.

It is a super-2 number, since 2×11920601081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11920601087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5960300540 + 5960300541.

It is an arithmetic number, because the mean of its divisors is an integer number (5960300541).

Almost surely, 2^11920601081 is an apocalyptic number.

It is an amenable number.

11920601081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11920601081 is an equidigital number, since it uses as much as digits as its factorization.

11920601081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 29.

The spelling of 11920601081 in words is "eleven billion, nine hundred twenty million, six hundred one thousand, eighty-one".