61211382131 has 8 divisors (see below), whose sum is σ = 61436815440. Its totient is φ = 60986061792.

The previous prime is 61211382109. The next prime is 61211382139. The reversal of 61211382131 is 13128311216.

61211382131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61211382131 - 2¹⁸ = 61211119987 is a prime.

It is a super-2 number, since 2×61211382131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61211382094 and 61211382103.

It is not an unprimeable number, because it can be changed into a prime (61211382139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146785 + ... + 1198973.

It is an arithmetic number, because the mean of its divisors is an integer number (7679601930).

Almost surely, 2^61211382131 is an apocalyptic number.

61211382131 is a deficient number, since it is larger than the sum of its proper divisors (225433309).

61211382131 is a wasteful number, since it uses less digits than its factorization.

61211382131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56485.

The product of its digits is 1728, while the sum is 29.

Adding to 61211382131 its reverse (13128311216), we get a palindrome (74339693347).

The spelling of 61211382131 in words is "sixty-one billion, two hundred eleven million, three hundred eighty-two thousand, one hundred thirty-one".