1220542451 has 2 divisors, whose sum is σ = 1220542452. Its totient is φ = 1220542450.

The previous prime is 1220542441. The next prime is 1220542457. The reversal of 1220542451 is 1542450221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220542451 - 2²⁶ = 1153433587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220542451.

It is not a weakly prime, because it can be changed into another prime (1220542457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610271225 + 610271226.

It is an arithmetic number, because the mean of its divisors is an integer number (610271226).

Almost surely, 2^1220542451 is an apocalyptic number.

1220542451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220542451 is an equidigital number, since it uses as much as digits as its factorization.

1220542451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 1220542451 is about 34936.2626936540. The cubic root of 1220542451 is about 1068.6880741749.

Adding to 1220542451 its reverse (1542450221), we get a palindrome (2762992672).

The spelling of 1220542451 in words is "one billion, two hundred twenty million, five hundred forty-two thousand, four hundred fifty-one".