78311903 has 2 divisors, whose sum is σ = 78311904. Its totient is φ = 78311902.

The previous prime is 78311887. The next prime is 78311929. The reversal of 78311903 is 30911387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78311903 - 2⁴ = 78311887 is a prime.

It is a super-2 number, since 2×78311903² = 12265508302962818, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78311903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78311953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39155951 + 39155952.

It is an arithmetic number, because the mean of its divisors is an integer number (39155952).

Almost surely, 2^78311903 is an apocalyptic number.

78311903 is a deficient number, since it is larger than the sum of its proper divisors (1).

78311903 is an equidigital number, since it uses as much as digits as its factorization.

78311903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 78311903 is about 8849.4012791827. The cubic root of 78311903 is about 427.8346214499.

The spelling of 78311903 in words is "seventy-eight million, three hundred eleven thousand, nine hundred three".