1321155454 has 4 divisors (see below), whose sum is σ = 1981733184. Its totient is φ = 660577726.

The previous prime is 1321155449. The next prime is 1321155457. The reversal of 1321155454 is 4545511231.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1321155454² = 3490903467267892232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321155457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330288862 + ... + 330288865.

It is an arithmetic number, because the mean of its divisors is an integer number (495433296).

Almost surely, 2^1321155454 is an apocalyptic number.

1321155454 is a deficient number, since it is larger than the sum of its proper divisors (660577730).

1321155454 is an equidigital number, since it uses as much as digits as its factorization.

1321155454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660577729.

The product of its digits is 12000, while the sum is 31.

The square root of 1321155454 is about 36347.7021832192. The cubic root of 1321155454 is about 1097.2812899523.

Adding to 1321155454 its reverse (4545511231), we get a palindrome (5866666685).

The spelling of 1321155454 in words is "one billion, three hundred twenty-one million, one hundred fifty-five thousand, four hundred fifty-four".