61598981 has 2 divisors, whose sum is σ = 61598982. Its totient is φ = 61598980.

The previous prime is 61598903. The next prime is 61598989. The reversal of 61598981 is 18989516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60310756 + 1288225 = 7766^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 61598981 - 2¹⁰ = 61597957 is a prime.

It is a super-2 number, since 2×61598981² = 7588868920476722, 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 (61598989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30799490 + 30799491.

It is an arithmetic number, because the mean of its divisors is an integer number (30799491).

Almost surely, 2^61598981 is an apocalyptic number.

It is an amenable number.

61598981 is a deficient number, since it is larger than the sum of its proper divisors (1).

61598981 is an equidigital number, since it uses as much as digits as its factorization.

61598981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 47.

The square root of 61598981 is about 7848.5018315600. The cubic root of 61598981 is about 394.9339867251.

The spelling of 61598981 in words is "sixty-one million, five hundred ninety-eight thousand, nine hundred eighty-one".