78501229 has 2 divisors, whose sum is σ = 78501230. Its totient is φ = 78501228.

The previous prime is 78501193. The next prime is 78501239. The reversal of 78501229 is 92210587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40985604 + 37515625 = 6402^2 + 6125^2 .

It is a cyclic number.

It is not a de Polignac number, because 78501229 - 2¹⁷ = 78370157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78501194 and 78501203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78501239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39250614 + 39250615.

It is an arithmetic number, because the mean of its divisors is an integer number (39250615).

Almost surely, 2^78501229 is an apocalyptic number.

It is an amenable number.

78501229 is a deficient number, since it is larger than the sum of its proper divisors (1).

78501229 is an equidigital number, since it uses as much as digits as its factorization.

78501229 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 34.

The square root of 78501229 is about 8860.0919295457. The cubic root of 78501229 is about 428.1791200803.

The spelling of 78501229 in words is "seventy-eight million, five hundred one thousand, two hundred twenty-nine".