78531151 has 2 divisors, whose sum is σ = 78531152. Its totient is φ = 78531150.

The previous prime is 78531127. The next prime is 78531163. The reversal of 78531151 is 15113587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78531151 - 2⁵ = 78531119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78531191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39265575 + 39265576.

It is an arithmetic number, because the mean of its divisors is an integer number (39265576).

Almost surely, 2^78531151 is an apocalyptic number.

78531151 is a deficient number, since it is larger than the sum of its proper divisors (1).

78531151 is an equidigital number, since it uses as much as digits as its factorization.

78531151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 31.

The square root of 78531151 is about 8861.7803515998. The cubic root of 78531151 is about 428.2335156115.

The spelling of 78531151 in words is "seventy-eight million, five hundred thirty-one thousand, one hundred fifty-one".