53978121 has 12 divisors (see below), whose sum is σ = 78486720. Its totient is φ = 35746200.

The previous prime is 53978117. The next prime is 53978129. The reversal of 53978121 is 12187935.

It is not a de Polignac number, because 53978121 - 2² = 53978117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53978129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18501 + ... + 21218.

It is an arithmetic number, because the mean of its divisors is an integer number (6540560).

Almost surely, 2^53978121 is an apocalyptic number.

It is an amenable number.

53978121 is a deficient number, since it is larger than the sum of its proper divisors (24508599).

53978121 is a wasteful number, since it uses less digits than its factorization.

53978121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39876 (or 39873 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 53978121 is about 7346.9804001372. The cubic root of 53978121 is about 377.9252602714.

The spelling of 53978121 in words is "fifty-three million, nine hundred seventy-eight thousand, one hundred twenty-one".