75981617 has 2 divisors, whose sum is σ = 75981618. Its totient is φ = 75981616.

The previous prime is 75981601. The next prime is 75981623. The reversal of 75981617 is 71618957.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75620416 + 361201 = 8696^2 + 601^2 .

It is a cyclic number.

It is not a de Polignac number, because 75981617 - 2⁴ = 75981601 is a prime.

It is a super-2 number, since 2×75981617² = 11546412243869378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75981637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37990808 + 37990809.

It is an arithmetic number, because the mean of its divisors is an integer number (37990809).

Almost surely, 2^75981617 is an apocalyptic number.

It is an amenable number.

75981617 is a deficient number, since it is larger than the sum of its proper divisors (1).

75981617 is an equidigital number, since it uses as much as digits as its factorization.

75981617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 75981617 is about 8716.7434859585. The cubic root of 75981617 is about 423.5482034150.

The spelling of 75981617 in words is "seventy-five million, nine hundred eighty-one thousand, six hundred seventeen".