76500421 has 2 divisors, whose sum is σ = 76500422. Its totient is φ = 76500420.

The previous prime is 76500407. The next prime is 76500481. The reversal of 76500421 is 12400567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67732900 + 8767521 = 8230^2 + 2961^2 .

It is an emirp because it is prime and its reverse (12400567) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76500421 - 2²¹ = 74403269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76500401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38250210 + 38250211.

It is an arithmetic number, because the mean of its divisors is an integer number (38250211).

Almost surely, 2^76500421 is an apocalyptic number.

It is an amenable number.

76500421 is a deficient number, since it is larger than the sum of its proper divisors (1).

76500421 is an equidigital number, since it uses as much as digits as its factorization.

76500421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 76500421 is about 8746.4519092030. The cubic root of 76500421 is about 424.5100161667.

Adding to 76500421 its reverse (12400567), we get a palindrome (88900988).

The spelling of 76500421 in words is "seventy-six million, five hundred thousand, four hundred twenty-one".