78142451 has 2 divisors, whose sum is σ = 78142452. Its totient is φ = 78142450.

The previous prime is 78142423. The next prime is 78142457. The reversal of 78142451 is 15424187.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78142451 - 2¹⁸ = 77880307 is a prime.

It is a super-2 number, since 2×78142451² = 12212485296574802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78142457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39071225 + 39071226.

It is an arithmetic number, because the mean of its divisors is an integer number (39071226).

Almost surely, 2^78142451 is an apocalyptic number.

78142451 is a deficient number, since it is larger than the sum of its proper divisors (1).

78142451 is an equidigital number, since it uses as much as digits as its factorization.

78142451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 78142451 is about 8839.8218873459. The cubic root of 78142451 is about 427.5258144757.

The spelling of 78142451 in words is "seventy-eight million, one hundred forty-two thousand, four hundred fifty-one".