61211131 has 4 divisors (see below), whose sum is σ = 62366112. Its totient is φ = 60056152.

The previous prime is 61211113. The next prime is 61211167. The reversal of 61211131 is 13111216.

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

It is a cyclic number.

It is not a de Polignac number, because 61211131 - 2⁵ = 61211099 is a prime.

It is a super-2 number, since 2×61211131² = 7493605116598322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61217131) 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, 577411 + ... + 577516.

It is an arithmetic number, because the mean of its divisors is an integer number (15591528).

Almost surely, 2^61211131 is an apocalyptic number.

61211131 is a deficient number, since it is larger than the sum of its proper divisors (1154981).

61211131 is a wasteful number, since it uses less digits than its factorization.

61211131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154980.

The product of its digits is 36, while the sum is 16.

The square root of 61211131 is about 7823.7542778387. The cubic root of 61211131 is about 394.1033574082.

Adding to 61211131 its reverse (13111216), we get a palindrome (74322347).

The spelling of 61211131 in words is "sixty-one million, two hundred eleven thousand, one hundred thirty-one".