61216131 has 8 divisors (see below), whose sum is σ = 81913104. Its totient is φ = 40664960.

The previous prime is 61216063. The next prime is 61216153. The reversal of 61216131 is 13161216.

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 61216131 - 2⁹ = 61215619 is a prime.

It is a super-2 number, since 2×61216131² = 7494829389218322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61216098 and 61216107.

It is not an unprimeable number, because it can be changed into a prime (61216531) 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, 35466 + ... + 37151.

It is an arithmetic number, because the mean of its divisors is an integer number (10239138).

Almost surely, 2^61216131 is an apocalyptic number.

61216131 is a deficient number, since it is larger than the sum of its proper divisors (20696973).

61216131 is a wasteful number, since it uses less digits than its factorization.

61216131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72901.

The product of its digits is 216, while the sum is 21.

The square root of 61216131 is about 7824.0738110015. The cubic root of 61216131 is about 394.1140878266.

Adding to 61216131 its reverse (13161216), we get a palindrome (74377347).

The spelling of 61216131 in words is "sixty-one million, two hundred sixteen thousand, one hundred thirty-one".