111355400261 has 6 divisors (see below), whose sum is σ = 129535873830. Its totient is φ = 95447485896.

The previous prime is 111355400251. The next prime is 111355400267. The reversal of 111355400261 is 162004553111.

It can be written as a sum of positive squares in only one way, i.e., 64318032100 + 47037368161 = 253610^2 + 216881^2 .

It is not a de Polignac number, because 111355400261 - 2²² = 111351205957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111355400267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1136279546 + ... + 1136279643.

It is an arithmetic number, because the mean of its divisors is an integer number (21589312305).

Almost surely, 2^111355400261 is an apocalyptic number.

It is an amenable number.

111355400261 is a deficient number, since it is larger than the sum of its proper divisors (18180473569).

111355400261 is an equidigital number, since it uses as much as digits as its factorization.

111355400261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272559203 (or 2272559196 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 111355400261 its reverse (162004553111), we get a palindrome (273359953372).

The spelling of 111355400261 in words is "one hundred eleven billion, three hundred fifty-five million, four hundred thousand, two hundred sixty-one".