1621537341 has 4 divisors (see below), whose sum is σ = 2162049792. Its totient is φ = 1081024892.

The previous prime is 1621537277. The next prime is 1621537361. The reversal of 1621537341 is 1437351261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1621537341 - 2⁶ = 1621537277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621537361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270256221 + ... + 270256226.

It is an arithmetic number, because the mean of its divisors is an integer number (540512448).

Almost surely, 2^1621537341 is an apocalyptic number.

It is an amenable number.

1621537341 is a deficient number, since it is larger than the sum of its proper divisors (540512451).

1621537341 is an equidigital number, since it uses as much as digits as its factorization.

1621537341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540512450.

The product of its digits is 15120, while the sum is 33.

The square root of 1621537341 is about 40268.3168384277. The cubic root of 1621537341 is about 1174.8316864085.

The spelling of 1621537341 in words is "one billion, six hundred twenty-one million, five hundred thirty-seven thousand, three hundred forty-one".