78925391 has 2 divisors, whose sum is σ = 78925392. Its totient is φ = 78925390.

The previous prime is 78925387. The next prime is 78925423. The reversal of 78925391 is 19352987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78925391 - 2² = 78925387 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 (78925381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39462695 + 39462696.

It is an arithmetic number, because the mean of its divisors is an integer number (39462696).

Almost surely, 2^78925391 is an apocalyptic number.

78925391 is a deficient number, since it is larger than the sum of its proper divisors (1).

78925391 is an equidigital number, since it uses as much as digits as its factorization.

78925391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 78925391 is about 8883.9963417372. The cubic root of 78925391 is about 428.9489219656.

The spelling of 78925391 in words is "seventy-eight million, nine hundred twenty-five thousand, three hundred ninety-one".