78310121 has 8 divisors (see below), whose sum is σ = 81923400. Its totient is φ = 74757760.

The previous prime is 78310103. The next prime is 78310139. The reversal of 78310121 is 12101387.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78310103) and next prime (78310139).

It can be written as a sum of positive squares in 4 ways, for example, as 235225 + 78074896 = 485^2 + 8836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78310121 is a prime.

It is a super-2 number, since 2×78310121² = 12264950102069282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78310151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12590 + ... + 17751.

It is an arithmetic number, because the mean of its divisors is an integer number (10240425).

Almost surely, 2^78310121 is an apocalyptic number.

It is an amenable number.

78310121 is a deficient number, since it is larger than the sum of its proper divisors (3613279).

78310121 is a wasteful number, since it uses less digits than its factorization.

78310121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30459.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 78310121 is about 8849.3005938323. The cubic root of 78310121 is about 427.8313762767.

The spelling of 78310121 in words is "seventy-eight million, three hundred ten thousand, one hundred twenty-one".