61880981 has 2 divisors, whose sum is σ = 61880982. Its totient is φ = 61880980.

The previous prime is 61880963. The next prime is 61881047. The reversal of 61880981 is 18908816.

61880981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 3740356 = 7625^2 + 1934^2 .

It is a cyclic number.

It is not a de Polignac number, because 61880981 - 2¹⁰ = 61879957 is a prime.

It is a super-2 number, since 2×61880981² = 7658511619044722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61880921) 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 as a sum of consecutive naturals, namely, 30940490 + 30940491.

It is an arithmetic number, because the mean of its divisors is an integer number (30940491).

Almost surely, 2^61880981 is an apocalyptic number.

It is an amenable number.

61880981 is a deficient number, since it is larger than the sum of its proper divisors (1).

61880981 is an equidigital number, since it uses as much as digits as its factorization.

61880981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 61880981 is about 7866.4465294058. The cubic root of 61880981 is about 395.5357383598.

The spelling of 61880981 in words is "sixty-one million, eight hundred eighty thousand, nine hundred eighty-one".