1221450754 has 4 divisors (see below), whose sum is σ = 1832176134. Its totient is φ = 610725376.

The previous prime is 1221450749. The next prime is 1221450779. The reversal of 1221450754 is 4570541221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4570541221 = 29927 ⋅152723.

It can be written as a sum of positive squares in only one way, i.e., 1152942025 + 68508729 = 33955^2 + 8277^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305362687 + ... + 305362690.

Almost surely, 2^1221450754 is an apocalyptic number.

1221450754 is a deficient number, since it is larger than the sum of its proper divisors (610725380).

1221450754 is an equidigital number, since it uses as much as digits as its factorization.

1221450754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610725379.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 1221450754 is about 34949.2597060367. The cubic root of 1221450754 is about 1068.9531071233.

Adding to 1221450754 its reverse (4570541221), we get a palindrome (5791991975).

The spelling of 1221450754 in words is "one billion, two hundred twenty-one million, four hundred fifty thousand, seven hundred fifty-four".