1461745621 has 4 divisors (see below), whose sum is σ = 1670566432. Its totient is φ = 1252924812.

The previous prime is 1461745603. The next prime is 1461745631. The reversal of 1461745621 is 1265471641.

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 1461745621 - 2²⁷ = 1327527893 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 (1461745631) 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, 104410395 + ... + 104410408.

It is an arithmetic number, because the mean of its divisors is an integer number (417641608).

Almost surely, 2^1461745621 is an apocalyptic number.

It is an amenable number.

1461745621 is a deficient number, since it is larger than the sum of its proper divisors (208820811).

1461745621 is an equidigital number, since it uses as much as digits as its factorization.

1461745621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208820810.

The product of its digits is 40320, while the sum is 37.

The square root of 1461745621 is about 38232.7820201460. The cubic root of 1461745621 is about 1134.8991406427.

The spelling of 1461745621 in words is "one billion, four hundred sixty-one million, seven hundred forty-five thousand, six hundred twenty-one".