78115853 has 2 divisors, whose sum is σ = 78115854. Its totient is φ = 78115852.

The previous prime is 78115837. The next prime is 78115861. The reversal of 78115853 is 35851187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54125449 + 23990404 = 7357^2 + 4898^2 .

It is a cyclic number.

It is not a de Polignac number, because 78115853 - 2⁴ = 78115837 is a prime.

It is a super-2 number, since 2×78115853² = 12204172979835218, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78115553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39057926 + 39057927.

It is an arithmetic number, because the mean of its divisors is an integer number (39057927).

Almost surely, 2^78115853 is an apocalyptic number.

It is an amenable number.

78115853 is a deficient number, since it is larger than the sum of its proper divisors (1).

78115853 is an equidigital number, since it uses as much as digits as its factorization.

78115853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 38.

The square root of 78115853 is about 8838.3173172273. The cubic root of 78115853 is about 427.4773021247.

The spelling of 78115853 in words is "seventy-eight million, one hundred fifteen thousand, eight hundred fifty-three".