653478121 has 4 divisors (see below), whose sum is σ = 656864212. Its totient is φ = 650092032.

The previous prime is 653478073. The next prime is 653478143. The reversal of 653478121 is 121874356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 205520896 + 447957225 = 14336^2 + 21165^2 .

It is a cyclic number.

It is not a de Polignac number, because 653478121 - 2²¹ = 651380969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653478151) 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, 1692756 + ... + 1693141.

It is an arithmetic number, because the mean of its divisors is an integer number (164216053).

Almost surely, 2^653478121 is an apocalyptic number.

It is an amenable number.

653478121 is a deficient number, since it is larger than the sum of its proper divisors (3386091).

653478121 is a wasteful number, since it uses less digits than its factorization.

653478121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386090.

The product of its digits is 40320, while the sum is 37.

The square root of 653478121 is about 25563.2181268322. The cubic root of 653478121 is about 867.7814265743.

The spelling of 653478121 in words is "six hundred fifty-three million, four hundred seventy-eight thousand, one hundred twenty-one".