78085151 has 4 divisors (see below), whose sum is σ = 78108600. Its totient is φ = 78061704.

The previous prime is 78085109. The next prime is 78085157. The reversal of 78085151 is 15158087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78085151 - 2²² = 73890847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78085157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5696 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (19527150).

Almost surely, 2^78085151 is an apocalyptic number.

78085151 is a deficient number, since it is larger than the sum of its proper divisors (23449).

78085151 is a wasteful number, since it uses less digits than its factorization.

78085151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23448.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 78085151 is about 8836.5802774603. The cubic root of 78085151 is about 427.4212907542.

The spelling of 78085151 in words is "seventy-eight million, eighty-five thousand, one hundred fifty-one".