1621312242 has 32 divisors (see below), whose sum is σ = 3550500864. Its totient is φ = 489488400.

The previous prime is 1621312207. The next prime is 1621312243. The reversal of 1621312242 is 2422131261.

It is not an unprimeable number, because it can be changed into a prime (1621312243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27438 + ... + 63209.

It is an arithmetic number, because the mean of its divisors is an integer number (110953152).

Almost surely, 2^1621312242 is an apocalyptic number.

1621312242 is an abundant number, since it is smaller than the sum of its proper divisors (1929188622).

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

1621312242 is a wasteful number, since it uses less digits than its factorization.

1621312242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90934.

The product of its digits is 1152, while the sum is 24.

The square root of 1621312242 is about 40265.5217524870. The cubic root of 1621312242 is about 1174.7773211941. Note that the first 3 decimals are identical.

The spelling of 1621312242 in words is "one billion, six hundred twenty-one million, three hundred twelve thousand, two hundred forty-two".