78252913 has 2 divisors, whose sum is σ = 78252914. Its totient is φ = 78252912.

The previous prime is 78252901. The next prime is 78252919. The reversal of 78252913 is 31925287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70761744 + 7491169 = 8412^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 78252913 - 2¹³ = 78244721 is a prime.

It is a super-2 number, since 2×78252913² = 12247036785971138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78252919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39126456 + 39126457.

It is an arithmetic number, because the mean of its divisors is an integer number (39126457).

Almost surely, 2^78252913 is an apocalyptic number.

It is an amenable number.

78252913 is a deficient number, since it is larger than the sum of its proper divisors (1).

78252913 is an equidigital number, since it uses as much as digits as its factorization.

78252913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 78252913 is about 8846.0676574397. The cubic root of 78252913 is about 427.7271694832.

The spelling of 78252913 in words is "seventy-eight million, two hundred fifty-two thousand, nine hundred thirteen".