1201541111 has 4 divisors (see below), whose sum is σ = 1224211752. Its totient is φ = 1178870472.

The previous prime is 1201541093. The next prime is 1201541153. The reversal of 1201541111 is 1111451021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111451021 = 619 ⋅1795559.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201541111 is a prime.

It is a super-2 number, since 2×1201541111² = 2887402082846228642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201541111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201541611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11335241 + ... + 11335346.

It is an arithmetic number, because the mean of its divisors is an integer number (306052938).

Almost surely, 2^1201541111 is an apocalyptic number.

1201541111 is a deficient number, since it is larger than the sum of its proper divisors (22670641).

1201541111 is an equidigital number, since it uses as much as digits as its factorization.

1201541111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22670640.

The product of its (nonzero) digits is 40, while the sum is 17.

The square root of 1201541111 is about 34663.2530354553. The cubic root of 1201541111 is about 1063.1132842503.

Adding to 1201541111 its reverse (1111451021), we get a palindrome (2312992132).

The spelling of 1201541111 in words is "one billion, two hundred one million, five hundred forty-one thousand, one hundred eleven".