1455231621 has 4 divisors (see below), whose sum is σ = 1940308832. Its totient is φ = 970154412.

The previous prime is 1455231611. The next prime is 1455231623. The reversal of 1455231621 is 1261325541.

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 not a de Polignac number, because 1455231621 - 2¹⁵ = 1455198853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1455231623) 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, 242538601 + ... + 242538606.

It is an arithmetic number, because the mean of its divisors is an integer number (485077208).

Almost surely, 2^1455231621 is an apocalyptic number.

It is an amenable number.

1455231621 is a deficient number, since it is larger than the sum of its proper divisors (485077211).

1455231621 is an equidigital number, since it uses as much as digits as its factorization.

1455231621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485077210.

The product of its digits is 7200, while the sum is 30.

The square root of 1455231621 is about 38147.4982272757. The cubic root of 1455231621 is about 1133.2108072750.

The spelling of 1455231621 in words is "one billion, four hundred fifty-five million, two hundred thirty-one thousand, six hundred twenty-one".