77873513 has 2 divisors, whose sum is σ = 77873514. Its totient is φ = 77873512.

The previous prime is 77873489. The next prime is 77873527. The reversal of 77873513 is 31537877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66797929 + 11075584 = 8173^2 + 3328^2 .

It is a cyclic number.

It is not a de Polignac number, because 77873513 - 2⁶ = 77873449 is a prime.

It is a super-2 number, since 2×77873513² = 12128568053922338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77873573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38936756 + 38936757.

It is an arithmetic number, because the mean of its divisors is an integer number (38936757).

Almost surely, 2^77873513 is an apocalyptic number.

It is an amenable number.

77873513 is a deficient number, since it is larger than the sum of its proper divisors (1).

77873513 is an equidigital number, since it uses as much as digits as its factorization.

77873513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 41.

The square root of 77873513 is about 8824.5970446248. The cubic root of 77873513 is about 427.0347877549.

The spelling of 77873513 in words is "seventy-seven million, eight hundred seventy-three thousand, five hundred thirteen".