1621342361 has 8 divisors (see below), whose sum is σ = 1651250400. Its totient is φ = 1591515360.

The previous prime is 1621342339. The next prime is 1621342369. The reversal of 1621342361 is 1632431261.

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-1621342361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621342369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20885 + ... + 60653.

It is an arithmetic number, because the mean of its divisors is an integer number (206406300).

Almost surely, 2^1621342361 is an apocalyptic number.

It is an amenable number.

1621342361 is a deficient number, since it is larger than the sum of its proper divisors (29908039).

1621342361 is an equidigital number, since it uses as much as digits as its factorization.

1621342361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40519.

The product of its digits is 5184, while the sum is 29.

The square root of 1621342361 is about 40265.8957555895. The cubic root of 1621342361 is about 1174.7845957335.

Subtracting 1621342361 from its reverse (1632431261), we obtain a square (11088900 = 3330²).

The spelling of 1621342361 in words is "one billion, six hundred twenty-one million, three hundred forty-two thousand, three hundred sixty-one".