61361131 has 4 divisors (see below), whose sum is σ = 66081232. Its totient is φ = 56641032.

The previous prime is 61361119. The next prime is 61361137. The reversal of 61361131 is 13116316.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61361131 is a prime.

It is a super-2 number, since 2×61361131² = 7530376795198322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61361137) 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, 2360031 + ... + 2360056.

It is an arithmetic number, because the mean of its divisors is an integer number (16520308).

Almost surely, 2^61361131 is an apocalyptic number.

61361131 is a deficient number, since it is larger than the sum of its proper divisors (4720101).

61361131 is a wasteful number, since it uses less digits than its factorization.

61361131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720100.

The product of its digits is 324, while the sum is 22.

The square root of 61361131 is about 7833.3346028368. The cubic root of 61361131 is about 394.4250161223.

Adding to 61361131 its reverse (13116316), we get a palindrome (74477447).

The spelling of 61361131 in words is "sixty-one million, three hundred sixty-one thousand, one hundred thirty-one".