78051901 has 2 divisors, whose sum is σ = 78051902. Its totient is φ = 78051900.

The previous prime is 78051889. The next prime is 78051917. The reversal of 78051901 is 10915087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72692676 + 5359225 = 8526^2 + 2315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78051901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78051931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39025950 + 39025951.

It is an arithmetic number, because the mean of its divisors is an integer number (39025951).

Almost surely, 2^78051901 is an apocalyptic number.

It is an amenable number.

78051901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78051901 is an equidigital number, since it uses as much as digits as its factorization.

78051901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 78051901 is about 8834.6986932210. The cubic root of 78051901 is about 427.3606143626.

Adding to 78051901 its reverse (10915087), we get a palindrome (88966988).

The spelling of 78051901 in words is "seventy-eight million, fifty-one thousand, nine hundred one".