75469781 has 2 divisors, whose sum is σ = 75469782. Its totient is φ = 75469780.

The previous prime is 75469759. The next prime is 75469787. The reversal of 75469781 is 18796457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72829156 + 2640625 = 8534^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 75469781 - 2¹⁸ = 75207637 is a prime.

It is a super-2 number, since 2×75469781² = 11391375688375922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75469787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37734890 + 37734891.

It is an arithmetic number, because the mean of its divisors is an integer number (37734891).

Almost surely, 2^75469781 is an apocalyptic number.

It is an amenable number.

75469781 is a deficient number, since it is larger than the sum of its proper divisors (1).

75469781 is an equidigital number, since it uses as much as digits as its factorization.

75469781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The square root of 75469781 is about 8687.3345164095. The cubic root of 75469781 is about 422.5950086862.

The spelling of 75469781 in words is "seventy-five million, four hundred sixty-nine thousand, seven hundred eighty-one".