1621341149 has 4 divisors (see below), whose sum is σ = 1624858620. Its totient is φ = 1617823680.

The previous prime is 1621341131. The next prime is 1621341151. The reversal of 1621341149 is 9411431261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9411431261 = 941 ⋅10001521.

It can be written as a sum of positive squares in 2 ways, for example, as 885955225 + 735385924 = 29765^2 + 27118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621341149 - 2⁸ = 1621340893 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 (1621341049) 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 3 ways as a sum of consecutive naturals, for example, 1758044 + ... + 1758965.

It is an arithmetic number, because the mean of its divisors is an integer number (406214655).

Almost surely, 2^1621341149 is an apocalyptic number.

It is an amenable number.

1621341149 is a deficient number, since it is larger than the sum of its proper divisors (3517471).

1621341149 is an equidigital number, since it uses as much as digits as its factorization.

1621341149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517470.

The product of its digits is 5184, while the sum is 32.

The square root of 1621341149 is about 40265.8807056297. The cubic root of 1621341149 is about 1174.7843030050.

The spelling of 1621341149 in words is "one billion, six hundred twenty-one million, three hundred forty-one thousand, one hundred forty-nine".