78143851 has 2 divisors, whose sum is σ = 78143852. Its totient is φ = 78143850.

The previous prime is 78143843. The next prime is 78143861. The reversal of 78143851 is 15834187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78143851 - 2³ = 78143843 is a prime.

It is a super-2 number, since 2×78143851² = 12212922898220402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78143851.

It is not a weakly prime, because it can be changed into another prime (78143861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39071925 + 39071926.

It is an arithmetic number, because the mean of its divisors is an integer number (39071926).

Almost surely, 2^78143851 is an apocalyptic number.

78143851 is a deficient number, since it is larger than the sum of its proper divisors (1).

78143851 is an equidigital number, since it uses as much as digits as its factorization.

78143851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 78143851 is about 8839.9010741071. The cubic root of 78143851 is about 427.5283676444.

The spelling of 78143851 in words is "seventy-eight million, one hundred forty-three thousand, eight hundred fifty-one".