75787381 has 2 divisors, whose sum is σ = 75787382. Its totient is φ = 75787380.

The previous prime is 75787379. The next prime is 75787417. The reversal of 75787381 is 18378757.

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., 71250481 + 4536900 = 8441^2 + 2130^2 .

It is a cyclic number.

It is not a de Polignac number, because 75787381 - 2¹ = 75787379 is a prime.

It is a super-2 number, since 2×75787381² = 11487454237678322, which contains 22 as substring.

Together with 75787379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75787301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37893690 + 37893691.

It is an arithmetic number, because the mean of its divisors is an integer number (37893691).

Almost surely, 2^75787381 is an apocalyptic number.

It is an amenable number.

75787381 is a deficient number, since it is larger than the sum of its proper divisors (1).

75787381 is an equidigital number, since it uses as much as digits as its factorization.

75787381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 46.

The square root of 75787381 is about 8705.5948102355. The cubic root of 75787381 is about 423.1869822224.

The spelling of 75787381 in words is "seventy-five million, seven hundred eighty-seven thousand, three hundred eighty-one".