61131262405 has 4 divisors (see below), whose sum is σ = 73357514892. Its totient is φ = 48905009920.

The previous prime is 61131262403. The next prime is 61131262427. The reversal of 61131262405 is 50426213116.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23233685476 + 37897576929 = 152426^2 + 194673^2 .

It is not a de Polignac number, because 61131262405 - 2¹ = 61131262403 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 (61131262403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6113126236 + ... + 6113126245.

It is an arithmetic number, because the mean of its divisors is an integer number (18339378723).

Almost surely, 2^61131262405 is an apocalyptic number.

It is an amenable number.

61131262405 is a deficient number, since it is larger than the sum of its proper divisors (12226252487).

61131262405 is a wasteful number, since it uses less digits than its factorization.

61131262405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12226252486.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 61131262405 in words is "sixty-one billion, one hundred thirty-one million, two hundred sixty-two thousand, four hundred five".