78086501 has 2 divisors, whose sum is σ = 78086502. Its totient is φ = 78086500.

The previous prime is 78086497. The next prime is 78086513. The reversal of 78086501 is 10568087.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43217476 + 34869025 = 6574^2 + 5905^2 .

It is an emirp because it is prime and its reverse (10568087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78086501 - 2² = 78086497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78086201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39043250 + 39043251.

It is an arithmetic number, because the mean of its divisors is an integer number (39043251).

Almost surely, 2^78086501 is an apocalyptic number.

It is an amenable number.

78086501 is a deficient number, since it is larger than the sum of its proper divisors (1).

78086501 is an equidigital number, since it uses as much as digits as its factorization.

78086501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 78086501 is about 8836.6566641462. The cubic root of 78086501 is about 427.4237539431.

It can be divided in two parts, 78086 and 501, that added together give a palindrome (78587).

The spelling of 78086501 in words is "seventy-eight million, eighty-six thousand, five hundred one".