61304981 has 2 divisors, whose sum is σ = 61304982. Its totient is φ = 61304980.

The previous prime is 61304951. The next prime is 61305019. The reversal of 61304981 is 18940316.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 10182481 = 7150^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 61304981 - 2¹⁴ = 61288597 is a prime.

It is a super-2 number, since 2×61304981² = 7516601390820722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61304921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30652490 + 30652491.

It is an arithmetic number, because the mean of its divisors is an integer number (30652491).

Almost surely, 2^61304981 is an apocalyptic number.

It is an amenable number.

61304981 is a deficient number, since it is larger than the sum of its proper divisors (1).

61304981 is an equidigital number, since it uses as much as digits as its factorization.

61304981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 61304981 is about 7829.7497405728. The cubic root of 61304981 is about 394.3046699949.

It can be divided in two parts, 6130 and 4981, that added together give a palindrome (11111).

The spelling of 61304981 in words is "sixty-one million, three hundred four thousand, nine hundred eighty-one".