78551357 has 2 divisors, whose sum is σ = 78551358. Its totient is φ = 78551356.

The previous prime is 78551327. The next prime is 78551381. The reversal of 78551357 is 75315587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70744921 + 7806436 = 8411^2 + 2794^2 .

It is a cyclic number.

It is not a de Polignac number, because 78551357 - 2⁶ = 78551293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78551327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39275678 + 39275679.

It is an arithmetic number, because the mean of its divisors is an integer number (39275679).

Almost surely, 2^78551357 is an apocalyptic number.

It is an amenable number.

78551357 is a deficient number, since it is larger than the sum of its proper divisors (1).

78551357 is an equidigital number, since it uses as much as digits as its factorization.

78551357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147000, while the sum is 41.

The square root of 78551357 is about 8862.9203426410. The cubic root of 78551357 is about 428.2702405047.

The spelling of 78551357 in words is "seventy-eight million, five hundred fifty-one thousand, three hundred fifty-seven".