78925381 has 2 divisors, whose sum is σ = 78925382. Its totient is φ = 78925380.

The previous prime is 78925367. The next prime is 78925387. The reversal of 78925381 is 18352987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 23184225 = 7466^2 + 4815^2 .

It is an emirp because it is prime and its reverse (18352987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78925381 is a prime.

It is a super-2 number, since 2×78925381² = 12458431531990322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78925387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39462690 + 39462691.

It is an arithmetic number, because the mean of its divisors is an integer number (39462691).

Almost surely, 2^78925381 is an apocalyptic number.

It is an amenable number.

78925381 is a deficient number, since it is larger than the sum of its proper divisors (1).

78925381 is an equidigital number, since it uses as much as digits as its factorization.

78925381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 78925381 is about 8883.9957789274. The cubic root of 78925381 is about 428.9489038493.

The spelling of 78925381 in words is "seventy-eight million, nine hundred twenty-five thousand, three hundred eighty-one".