1621319155 has 8 divisors (see below), whose sum is σ = 2060029152. Its totient is φ = 1220757888.

The previous prime is 1621319149. The next prime is 1621319159. The reversal of 1621319155 is 5519131261.

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 1621319155 - 2⁷ = 1621319027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621319155.

It is not an unprimeable number, because it can be changed into a prime (1621319159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9537087 + ... + 9537256.

It is an arithmetic number, because the mean of its divisors is an integer number (257503644).

Almost surely, 2^1621319155 is an apocalyptic number.

1621319155 is a deficient number, since it is larger than the sum of its proper divisors (438709997).

1621319155 is a wasteful number, since it uses less digits than its factorization.

1621319155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19074365.

The product of its digits is 8100, while the sum is 34.

The square root of 1621319155 is about 40265.6075950680. The cubic root of 1621319155 is about 1174.7789908754.

The spelling of 1621319155 in words is "one billion, six hundred twenty-one million, three hundred nineteen thousand, one hundred fifty-five".