611491131 has 6 divisors (see below), whose sum is σ = 883264980. Its totient is φ = 407660748.

The previous prime is 611491109. The next prime is 611491141. The reversal of 611491131 is 131194116.

611491131 is a `hidden beast` number, since 611 + 4 + 9 + 11 + 31 = 666.

It is not a de Polignac number, because 611491131 - 2¹¹ = 611489083 is a prime.

It is a super-2 number, since 2×611491131² = 747842806583318322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 611491095 and 611491104.

It is not an unprimeable number, because it can be changed into a prime (611491141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33971721 + ... + 33971738.

It is an arithmetic number, because the mean of its divisors is an integer number (147210830).

Almost surely, 2^611491131 is an apocalyptic number.

611491131 is a deficient number, since it is larger than the sum of its proper divisors (271773849).

611491131 is a wasteful number, since it uses less digits than its factorization.

611491131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67943465 (or 67943462 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 611491131 is about 24728.3467097985. The cubic root of 611491131 is about 848.7830941682.

The spelling of 611491131 in words is "six hundred eleven million, four hundred ninety-one thousand, one hundred thirty-one".