78951149 has 2 divisors, whose sum is σ = 78951150. Its totient is φ = 78951148.

The previous prime is 78951133. The next prime is 78951161. The reversal of 78951149 is 94115987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 3087049 = 8710^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 78951149 - 2⁴ = 78951133 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78951109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39475574 + 39475575.

It is an arithmetic number, because the mean of its divisors is an integer number (39475575).

Almost surely, 2^78951149 is an apocalyptic number.

It is an amenable number.

78951149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78951149 is an equidigital number, since it uses as much as digits as its factorization.

78951149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 78951149 is about 8885.4459089007. The cubic root of 78951149 is about 428.9955806494.

The spelling of 78951149 in words is "seventy-eight million, nine hundred fifty-one thousand, one hundred forty-nine".