75825781 has 2 divisors, whose sum is σ = 75825782. Its totient is φ = 75825780.

The previous prime is 75825697. The next prime is 75825803. The reversal of 75825781 is 18752857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48525156 + 27300625 = 6966^2 + 5225^2 .

It is a cyclic number.

It is not a de Polignac number, because 75825781 - 2¹³ = 75817589 is a prime.

It is a super-2 number, since 2×75825781² = 11499098128519922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75820781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37912890 + 37912891.

It is an arithmetic number, because the mean of its divisors is an integer number (37912891).

Almost surely, 2^75825781 is an apocalyptic number.

It is an amenable number.

75825781 is a deficient number, since it is larger than the sum of its proper divisors (1).

75825781 is an equidigital number, since it uses as much as digits as its factorization.

75825781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 43.

The square root of 75825781 is about 8707.8000091872. The cubic root of 75825781 is about 423.2584437072.

The spelling of 75825781 in words is "seventy-five million, eight hundred twenty-five thousand, seven hundred eighty-one".