61020981 has 24 divisors (see below), whose sum is σ = 101874240. Its totient is φ = 34474176.

The previous prime is 61020977. The next prime is 61021031. The reversal of 61020981 is 18902016.

It is not a de Polignac number, because 61020981 - 2² = 61020977 is a prime.

It is a super-2 number, since 2×61020981² = 7447120244404722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61020931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166 + ... + 11048.

It is an arithmetic number, because the mean of its divisors is an integer number (4244760).

Almost surely, 2^61020981 is an apocalyptic number.

It is an amenable number.

61020981 is a deficient number, since it is larger than the sum of its proper divisors (40853259).

61020981 is a wasteful number, since it uses less digits than its factorization.

61020981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985 (or 10982 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 61020981 is about 7811.5927313193. The cubic root of 61020981 is about 393.6948451846.

Adding to 61020981 its reverse (18902016), we get a palindrome (79922997).

It can be divided in two parts, 61020 and 981, that added together give a square (62001 = 249²).

The spelling of 61020981 in words is "sixty-one million, twenty thousand, nine hundred eighty-one".