78250001 has 2 divisors, whose sum is σ = 78250002. Its totient is φ = 78250000.

The previous prime is 78249973. The next prime is 78250009. The reversal of 78250001 is 10005287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71385601 + 6864400 = 8449^2 + 2620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78250001 is a prime.

It is a super-2 number, since 2×78250001² = 12246125313000002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78250009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39125000 + 39125001.

It is an arithmetic number, because the mean of its divisors is an integer number (39125001).

Almost surely, 2^78250001 is an apocalyptic number.

It is an amenable number.

78250001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78250001 is an equidigital number, since it uses as much as digits as its factorization.

78250001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 78250001 is about 8845.9030630004. The cubic root of 78250001 is about 427.7218637938.

Adding to 78250001 its reverse (10005287), we get a palindrome (88255288).

The spelling of 78250001 in words is "seventy-eight million, two hundred fifty thousand, one".