113121405 has 12 divisors (see below), whose sum is σ = 196077180. Its totient is φ = 60331392.

The previous prime is 113121401. The next prime is 113121409. The reversal of 113121405 is 504121311.

It is an interprime number because it is at equal distance from previous prime (113121401) and next prime (113121409).

It can be written as a sum of positive squares in 2 ways, for example, as 54552996 + 58568409 = 7386^2 + 7653^2 .

It is not a de Polignac number, because 113121405 - 2² = 113121401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113121401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1256860 + ... + 1256949.

It is an arithmetic number, because the mean of its divisors is an integer number (16339765).

Almost surely, 2^113121405 is an apocalyptic number.

113121405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

113121405 is a deficient number, since it is larger than the sum of its proper divisors (82955775).

113121405 is a wasteful number, since it uses less digits than its factorization.

113121405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513820 (or 2513817 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 113121405 is about 10635.8546906208. The cubic root of 113121405 is about 483.6318903209.

Adding to 113121405 its reverse (504121311), we get a palindrome (617242716).

It can be divided in two parts, 113121 and 405, that added together give a triangular number (113526 = T₄₇₆).

The spelling of 113121405 in words is "one hundred thirteen million, one hundred twenty-one thousand, four hundred five".