76820531 has 2 divisors, whose sum is σ = 76820532. Its totient is φ = 76820530.

The previous prime is 76820521. The next prime is 76820539. The reversal of 76820531 is 13502867.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76820531 - 2¹⁸ = 76558387 is a prime.

It is a super-2 number, since 2×76820531² = 11802787966243922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (76820539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38410265 + 38410266.

It is an arithmetic number, because the mean of its divisors is an integer number (38410266).

Almost surely, 2^76820531 is an apocalyptic number.

76820531 is a deficient number, since it is larger than the sum of its proper divisors (1).

76820531 is an equidigital number, since it uses as much as digits as its factorization.

76820531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 76820531 is about 8764.7322263718. The cubic root of 76820531 is about 425.1013018036.

The spelling of 76820531 in words is "seventy-six million, eight hundred twenty thousand, five hundred thirty-one".