78954121 has 4 divisors (see below), whose sum is σ = 79003152. Its totient is φ = 78905092.

The previous prime is 78954119. The next prime is 78954133. The reversal of 78954121 is 12145987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78954121 - 2¹ = 78954119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78954521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22015 + ... + 25348.

It is an arithmetic number, because the mean of its divisors is an integer number (19750788).

Almost surely, 2^78954121 is an apocalyptic number.

It is an amenable number.

78954121 is a deficient number, since it is larger than the sum of its proper divisors (49031).

78954121 is a wasteful number, since it uses less digits than its factorization.

78954121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49030.

The product of its digits is 20160, while the sum is 37.

The square root of 78954121 is about 8885.6131471047. The cubic root of 78954121 is about 429.0009635512. Note that the first 3 decimals are identical.

The spelling of 78954121 in words is "seventy-eight million, nine hundred fifty-four thousand, one hundred twenty-one".