1621345959 has 6 divisors (see below), whose sum is σ = 2341944176. Its totient is φ = 1080897300.

The previous prime is 1621345951. The next prime is 1621345961. The reversal of 1621345959 is 9595431261.

1621345959 is a `hidden beast` number, since 1 + 6 + 21 + 34 + 595 + 9 = 666.

It is not a de Polignac number, because 1621345959 - 2³ = 1621345951 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 (1621345951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90074767 + ... + 90074784.

Almost surely, 2^1621345959 is an apocalyptic number.

1621345959 is a deficient number, since it is larger than the sum of its proper divisors (720598217).

1621345959 is a wasteful number, since it uses less digits than its factorization.

1621345959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180149557 (or 180149554 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 1621345959 is about 40265.9404335724. The cubic root of 1621345959 is about 1174.7854647401.

The spelling of 1621345959 in words is "one billion, six hundred twenty-one million, three hundred forty-five thousand, nine hundred fifty-nine".