1478925221 has 4 divisors (see below), whose sum is σ = 1480600992. Its totient is φ = 1477249452.

The previous prime is 1478925181. The next prime is 1478925233. The reversal of 1478925221 is 1225298741.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1225298741 = 521 ⋅2351821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1478925221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1478925241) 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, 836561 + ... + 838326.

It is an arithmetic number, because the mean of its divisors is an integer number (370150248).

Almost surely, 2^1478925221 is an apocalyptic number.

It is an amenable number.

1478925221 is a deficient number, since it is larger than the sum of its proper divisors (1675771).

1478925221 is an equidigital number, since it uses as much as digits as its factorization.

1478925221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675770.

The product of its digits is 80640, while the sum is 41.

The square root of 1478925221 is about 38456.7968114870. The cubic root of 1478925221 is about 1139.3279153835.

The spelling of 1478925221 in words is "one billion, four hundred seventy-eight million, nine hundred twenty-five thousand, two hundred twenty-one".