78273101 has 2 divisors, whose sum is σ = 78273102. Its totient is φ = 78273100.

The previous prime is 78273079. The next prime is 78273113. The reversal of 78273101 is 10137287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76650025 + 1623076 = 8755^2 + 1274^2 .

It is a cyclic number.

It is not a de Polignac number, because 78273101 - 2⁶ = 78273037 is a prime.

It is a super-2 number, since 2×78273101² = 12253356680312402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78273131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39136550 + 39136551.

It is an arithmetic number, because the mean of its divisors is an integer number (39136551).

Almost surely, 2^78273101 is an apocalyptic number.

It is an amenable number.

78273101 is a deficient number, since it is larger than the sum of its proper divisors (1).

78273101 is an equidigital number, since it uses as much as digits as its factorization.

78273101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 78273101 is about 8847.2086558417. The cubic root of 78273101 is about 427.7639485769.

The spelling of 78273101 in words is "seventy-eight million, two hundred seventy-three thousand, one hundred one".