78193151 has 4 divisors (see below), whose sum is σ = 82308600. Its totient is φ = 74077704.

The previous prime is 78193121. The next prime is 78193163. The reversal of 78193151 is 15139187.

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 78193151 - 2¹⁴ = 78176767 is a prime.

It is a super-2 number, since 2×78193151² = 12228337726617602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78193121) 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, 2057696 + ... + 2057733.

It is an arithmetic number, because the mean of its divisors is an integer number (20577150).

Almost surely, 2^78193151 is an apocalyptic number.

78193151 is a deficient number, since it is larger than the sum of its proper divisors (4115449).

78193151 is a wasteful number, since it uses less digits than its factorization.

78193151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115448.

The product of its digits is 7560, while the sum is 35.

The square root of 78193151 is about 8842.6891271830. The cubic root of 78193151 is about 427.6182562168.

The spelling of 78193151 in words is "seventy-eight million, one hundred ninety-three thousand, one hundred fifty-one".