78396151 has 2 divisors, whose sum is σ = 78396152. Its totient is φ = 78396150.

The previous prime is 78396137. The next prime is 78396221. The reversal of 78396151 is 15169387.

It is a weak prime.

It is an emirp because it is prime and its reverse (15169387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78396151 - 2⁵ = 78396119 is a prime.

It is a super-2 number, since 2×78396151² = 12291912983229602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78396751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39198075 + 39198076.

It is an arithmetic number, because the mean of its divisors is an integer number (39198076).

Almost surely, 2^78396151 is an apocalyptic number.

78396151 is a deficient number, since it is larger than the sum of its proper divisors (1).

78396151 is an equidigital number, since it uses as much as digits as its factorization.

78396151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 78396151 is about 8854.1600956838. The cubic root of 78396151 is about 427.9879880607.

The spelling of 78396151 in words is "seventy-eight million, three hundred ninety-six thousand, one hundred fifty-one".