75878981 has 2 divisors, whose sum is σ = 75878982. Its totient is φ = 75878980.

The previous prime is 75878969. The next prime is 75879019. The reversal of 75878981 is 18987857.

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., 54626881 + 21252100 = 7391^2 + 4610^2 .

It is a cyclic number.

It is not a de Polignac number, because 75878981 - 2¹⁰ = 75877957 is a prime.

It is a super-2 number, since 2×75878981² = 11515239515196722, 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 (75878911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37939490 + 37939491.

It is an arithmetic number, because the mean of its divisors is an integer number (37939491).

Almost surely, 2^75878981 is an apocalyptic number.

It is an amenable number.

75878981 is a deficient number, since it is larger than the sum of its proper divisors (1).

75878981 is an equidigital number, since it uses as much as digits as its factorization.

75878981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 53.

The square root of 75878981 is about 8710.8542061040. The cubic root of 75878981 is about 423.3574077835.

The spelling of 75878981 in words is "seventy-five million, eight hundred seventy-eight thousand, nine hundred eighty-one".