111631240561541 has 4 divisors (see below), whose sum is σ = 111634108602432. Its totient is φ = 111628372520652.

The previous prime is 111631240561523. The next prime is 111631240561549. The reversal of 111631240561541 is 145165042136111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111631240561541 - 2⁴⁶ = 41262496383877 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 (111631240561549) 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, 1433962061 + ... + 1434039906.

It is an arithmetic number, because the mean of its divisors is an integer number (27908527150608).

Almost surely, 2^{111631240561541} is an apocalyptic number.

It is an amenable number.

111631240561541 is a deficient number, since it is larger than the sum of its proper divisors (2868040891).

111631240561541 is an equidigital number, since it uses as much as digits as its factorization.

111631240561541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868040890.

The product of its (nonzero) digits is 86400, while the sum is 41.

Adding to 111631240561541 its reverse (145165042136111), we get a palindrome (256796282697652).

The spelling of 111631240561541 in words is "one hundred eleven trillion, six hundred thirty-one billion, two hundred forty million, five hundred sixty-one thousand, five hundred forty-one".