78698101 has 2 divisors, whose sum is σ = 78698102. Its totient is φ = 78698100.

The previous prime is 78698099. The next prime is 78698107. The reversal of 78698101 is 10189687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70997476 + 7700625 = 8426^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 78698101 - 2¹ = 78698099 is a prime.

It is a super-2 number, since 2×78698101² = 12386782202012402, which contains 22 as substring.

Together with 78698099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78698107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39349050 + 39349051.

It is an arithmetic number, because the mean of its divisors is an integer number (39349051).

Almost surely, 2^78698101 is an apocalyptic number.

It is an amenable number.

78698101 is a deficient number, since it is larger than the sum of its proper divisors (1).

78698101 is an equidigital number, since it uses as much as digits as its factorization.

78698101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 78698101 is about 8871.1950153291. The cubic root of 78698101 is about 428.5367625029.

The spelling of 78698101 in words is "seventy-eight million, six hundred ninety-eight thousand, one hundred one".