61190981 has 2 divisors, whose sum is σ = 61190982. Its totient is φ = 61190980.

The previous prime is 61190953. The next prime is 61190989. The reversal of 61190981 is 18909116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 17181025 = 6634^2 + 4145^2 .

It is a cyclic number.

It is not a de Polignac number, because 61190981 - 2¹⁰ = 61189957 is a prime.

It is a super-2 number, since 2×61190981² = 7488672311484722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61190989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30595490 + 30595491.

It is an arithmetic number, because the mean of its divisors is an integer number (30595491).

Almost surely, 2^61190981 is an apocalyptic number.

It is an amenable number.

61190981 is a deficient number, since it is larger than the sum of its proper divisors (1).

61190981 is an equidigital number, since it uses as much as digits as its factorization.

61190981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 61190981 is about 7822.4664269014. The cubic root of 61190981 is about 394.0601078987.

The spelling of 61190981 in words is "sixty-one million, one hundred ninety thousand, nine hundred eighty-one".