61011531 has 12 divisors (see below), whose sum is σ = 100717552. Its totient is φ = 34863696.

The previous prime is 61011523. The next prime is 61011541. The reversal of 61011531 is 13511016.

61011531 is a `hidden beast` number, since 610 + 1 + 1 + 53 + 1 = 666.

It is not a de Polignac number, because 61011531 - 2³ = 61011523 is a prime.

It is a super-2 number, since 2×61011531² = 7444813829927922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61011541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 484156 + ... + 484281.

Almost surely, 2^61011531 is an apocalyptic number.

61011531 is a deficient number, since it is larger than the sum of its proper divisors (39706021).

61011531 is a wasteful number, since it uses less digits than its factorization.

61011531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968450 (or 968447 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 61011531 is about 7810.9878376554. The cubic root of 61011531 is about 393.6745209819.

Adding to 61011531 its reverse (13511016), we get a palindrome (74522547).

The spelling of 61011531 in words is "sixty-one million, eleven thousand, five hundred thirty-one".