1451131221 has 16 divisors (see below), whose sum is σ = 1942291008. Its totient is φ = 963705600.

The previous prime is 1451131211. The next prime is 1451131229. The reversal of 1451131221 is 1221311541.

It is not a de Polignac number, because 1451131221 - 2²² = 1446936917 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1451131229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1646701 + ... + 1647581.

It is an arithmetic number, because the mean of its divisors is an integer number (121393188).

Almost surely, 2^1451131221 is an apocalyptic number.

It is an amenable number.

1451131221 is a deficient number, since it is larger than the sum of its proper divisors (491159787).

1451131221 is an equidigital number, since it uses as much as digits as its factorization.

1451131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372.

The product of its digits is 240, while the sum is 21.

The square root of 1451131221 is about 38093.7162928481. The cubic root of 1451131221 is about 1132.1454582673.

Adding to 1451131221 its reverse (1221311541), we get a palindrome (2672442762).

The spelling of 1451131221 in words is "one billion, four hundred fifty-one million, one hundred thirty-one thousand, two hundred twenty-one".