11020515391 has 2 divisors, whose sum is σ = 11020515392. Its totient is φ = 11020515390.

The previous prime is 11020515347. The next prime is 11020515427. The reversal of 11020515391 is 19351502011.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11020515391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11020515991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510257695 + 5510257696.

It is an arithmetic number, because the mean of its divisors is an integer number (5510257696).

Almost surely, 2^11020515391 is an apocalyptic number.

11020515391 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020515391 is an equidigital number, since it uses as much as digits as its factorization.

11020515391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 28.

The spelling of 11020515391 in words is "eleven billion, twenty million, five hundred fifteen thousand, three hundred ninety-one".