1621563241 has 8 divisors (see below), whose sum is σ = 1725580800. Its totient is φ = 1518504768.

The previous prime is 1621563233. The next prime is 1621563247. The reversal of 1621563241 is 1423651261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1621563241 - 2³ = 1621563233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621563247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236281 + ... + 243046.

It is an arithmetic number, because the mean of its divisors is an integer number (215697600).

Almost surely, 2^1621563241 is an apocalyptic number.

It is an amenable number.

1621563241 is a deficient number, since it is larger than the sum of its proper divisors (104017559).

1621563241 is a wasteful number, since it uses less digits than its factorization.

1621563241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479543.

The product of its digits is 8640, while the sum is 31.

The square root of 1621563241 is about 40268.6384299246. The cubic root of 1621563241 is about 1174.8379413737.

The spelling of 1621563241 in words is "one billion, six hundred twenty-one million, five hundred sixty-three thousand, two hundred forty-one".