59999981 has 2 divisors, whose sum is σ = 59999982. Its totient is φ = 59999980.

The previous prime is 59999971. The next prime is 59999983. The reversal of 59999981 is 18999995.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41860900 + 18139081 = 6470^2 + 4259^2 .

It is a cyclic number.

It is not a de Polignac number, because 59999981 - 2⁶ = 59999917 is a prime.

It is a super-2 number, since 2×59999981² = 7199995440000722, which contains 22 as substring.

Together with 59999983, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 59999981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (59999983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29999990 + 29999991.

It is an arithmetic number, because the mean of its divisors is an integer number (29999991).

Almost surely, 2^59999981 is an apocalyptic number.

It is an amenable number.

59999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

59999981 is an equidigital number, since it uses as much as digits as its factorization.

59999981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2361960, while the sum is 59.

The square root of 59999981 is about 7745.9654659700. The cubic root of 59999981 is about 391.4867227933.

The spelling of 59999981 in words is "fifty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".