111551213461 has 2 divisors, whose sum is σ = 111551213462. Its totient is φ = 111551213460.

The previous prime is 111551213453. The next prime is 111551213539. The reversal of 111551213461 is 164312155111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94183927236 + 17367286225 = 306894^2 + 131785^2 .

It is a cyclic number.

It is not a de Polignac number, because 111551213461 - 2³ = 111551213453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111551213401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55775606730 + 55775606731.

It is an arithmetic number, because the mean of its divisors is an integer number (55775606731).

Almost surely, 2^111551213461 is an apocalyptic number.

It is an amenable number.

111551213461 is a deficient number, since it is larger than the sum of its proper divisors (1).

111551213461 is an equidigital number, since it uses as much as digits as its factorization.

111551213461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 31.

Adding to 111551213461 its reverse (164312155111), we get a palindrome (275863368572).

The spelling of 111551213461 in words is "one hundred eleven billion, five hundred fifty-one million, two hundred thirteen thousand, four hundred sixty-one".