1621101051 has 24 divisors (see below), whose sum is σ = 2402440560. Its totient is φ = 1052975616.

The previous prime is 1621101049. The next prime is 1621101059. The reversal of 1621101051 is 1501011261.

It is a happy number.

It is not a de Polignac number, because 1621101051 - 2¹ = 1621101049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621101059) 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 23 ways as a sum of consecutive naturals, for example, 46495 + ... + 73511.

It is an arithmetic number, because the mean of its divisors is an integer number (100101690).

Almost surely, 2^1621101051 is an apocalyptic number.

1621101051 is a deficient number, since it is larger than the sum of its proper divisors (781339509).

1621101051 is a wasteful number, since it uses less digits than its factorization.

1621101051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27195 (or 27192 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 1621101051 is about 40262.8991877137. The cubic root of 1621101051 is about 1174.7263104215.

The spelling of 1621101051 in words is "one billion, six hundred twenty-one million, one hundred one thousand, fifty-one".