1213401181 has 2 divisors, whose sum is σ = 1213401182. Its totient is φ = 1213401180.

The previous prime is 1213401157. The next prime is 1213401221. The reversal of 1213401181 is 1811043121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 870781081 + 342620100 = 29509^2 + 18510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213401181 - 2²⁵ = 1179846749 is a prime.

It is a super-2 number, since 2×1213401181² = 2944684852104389522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213401131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606700590 + 606700591.

It is an arithmetic number, because the mean of its divisors is an integer number (606700591).

Almost surely, 2^1213401181 is an apocalyptic number.

It is an amenable number.

1213401181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213401181 is an equidigital number, since it uses as much as digits as its factorization.

1213401181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1213401181 is about 34833.9084944541. The cubic root of 1213401181 is about 1066.5997341573.

The spelling of 1213401181 in words is "one billion, two hundred thirteen million, four hundred one thousand, one hundred eighty-one".