61010991 has 12 divisors (see below), whose sum is σ = 89335168. Its totient is φ = 40116384.

The previous prime is 61010953. The next prime is 61011053. The reversal of 61010991 is 19901016.

It is not a de Polignac number, because 61010991 - 2⁷ = 61010863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61010921) 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, 45775 + ... + 47088.

Almost surely, 2^61010991 is an apocalyptic number.

61010991 is a deficient number, since it is larger than the sum of its proper divisors (28324177).

61010991 is a wasteful number, since it uses less digits than its factorization.

61010991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92942 (or 92939 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 61010991 is about 7810.9532708883. The cubic root of 61010991 is about 393.6733595355.

It can be divided in two parts, 61010 and 991, that added together give a square (62001 = 249²).

The spelling of 61010991 in words is "sixty-one million, ten thousand, nine hundred ninety-one".