11721511097 has 2 divisors, whose sum is σ = 11721511098. Its totient is φ = 11721511096.

The previous prime is 11721511013. The next prime is 11721511117. The reversal of 11721511097 is 79011512711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7186970176 + 4534540921 = 84776^2 + 67339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11721511097 is a prime.

It is not a weakly prime, because it can be changed into another prime (11721514097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860755548 + 5860755549.

It is an arithmetic number, because the mean of its divisors is an integer number (5860755549).

Almost surely, 2^11721511097 is an apocalyptic number.

It is an amenable number.

11721511097 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721511097 is an equidigital number, since it uses as much as digits as its factorization.

11721511097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 35.

The spelling of 11721511097 in words is "eleven billion, seven hundred twenty-one million, five hundred eleven thousand, ninety-seven".