1622155991 has 8 divisors (see below), whose sum is σ = 1629773040. Its totient is φ = 1614555072.

The previous prime is 1622155949. The next prime is 1622156009. The reversal of 1622155991 is 1995512261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1622155991 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 (1622155921) 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 7 ways as a sum of consecutive naturals, for example, 227801 + ... + 234813.

It is an arithmetic number, because the mean of its divisors is an integer number (203721630).

Almost surely, 2^1622155991 is an apocalyptic number.

1622155991 is a deficient number, since it is larger than the sum of its proper divisors (7617049).

1622155991 is an equidigital number, since it uses as much as digits as its factorization.

1622155991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8065.

The product of its digits is 48600, while the sum is 41.

The square root of 1622155991 is about 40275.9977033468. The cubic root of 1622155991 is about 1174.9810749329.

The spelling of 1622155991 in words is "one billion, six hundred twenty-two million, one hundred fifty-five thousand, nine hundred ninety-one".