11213551397 has 2 divisors, whose sum is σ = 11213551398. Its totient is φ = 11213551396.

The previous prime is 11213551381. The next prime is 11213551403. The reversal of 11213551397 is 79315531211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10977591076 + 235960321 = 104774^2 + 15361^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213551397 - 2⁴ = 11213551381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11213551397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213551357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606775698 + 5606775699.

It is an arithmetic number, because the mean of its divisors is an integer number (5606775699).

Almost surely, 2^11213551397 is an apocalyptic number.

It is an amenable number.

11213551397 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213551397 is an equidigital number, since it uses as much as digits as its factorization.

11213551397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 38.

The spelling of 11213551397 in words is "eleven billion, two hundred thirteen million, five hundred fifty-one thousand, three hundred ninety-seven".