61126981 has 4 divisors (see below), whose sum is σ = 62039392. Its totient is φ = 60214572.

The previous prime is 61126979. The next prime is 61126987. The reversal of 61126981 is 18962116.

61126981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61126981 - 2¹ = 61126979 is a prime.

It is a super-4 number, since 4×61126981⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61126987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456105 + ... + 456238.

It is an arithmetic number, because the mean of its divisors is an integer number (15509848).

Almost surely, 2^61126981 is an apocalyptic number.

It is an amenable number.

61126981 is a deficient number, since it is larger than the sum of its proper divisors (912411).

61126981 is an equidigital number, since it uses as much as digits as its factorization.

61126981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912410.

The product of its digits is 5184, while the sum is 34.

The square root of 61126981 is about 7818.3745753193. The cubic root of 61126981 is about 393.9226767275.

The spelling of 61126981 in words is "sixty-one million, one hundred twenty-six thousand, nine hundred eighty-one".