561221148 has 24 divisors (see below), whose sum is σ = 1351759360. Its totient is φ = 181038960.

The previous prime is 561221131. The next prime is 561221159. The reversal of 561221148 is 841122165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 753958 + ... + 754701.

Almost surely, 2^561221148 is an apocalyptic number.

It is an amenable number.

561221148 is an abundant number, since it is smaller than the sum of its proper divisors (790538212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561221148 is a wasteful number, since it uses less digits than its factorization.

561221148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508697 (or 1508695 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 561221148 is about 23690.1065426055. The cubic root of 561221148 is about 824.8557558652.

The spelling of 561221148 in words is "five hundred sixty-one million, two hundred twenty-one thousand, one hundred forty-eight".