53978109 has 4 divisors (see below), whose sum is σ = 71970816. Its totient is φ = 35985404.

The previous prime is 53978087. The next prime is 53978117. The reversal of 53978109 is 90187935.

It is a happy number.

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 53978109 - 2⁷ = 53977981 is a prime.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8996349 + ... + 8996354.

It is an arithmetic number, because the mean of its divisors is an integer number (17992704).

Almost surely, 2^53978109 is an apocalyptic number.

It is an amenable number.

53978109 is a deficient number, since it is larger than the sum of its proper divisors (17992707).

53978109 is a wasteful number, since it uses less digits than its factorization.

53978109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17992706.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 53978109 is about 7346.9795834751. The cubic root of 53978109 is about 377.9252322656.

The spelling of 53978109 in words is "fifty-three million, nine hundred seventy-eight thousand, one hundred nine".