1220422451 has 4 divisors (see below), whose sum is σ = 1221075912. Its totient is φ = 1219768992.

The previous prime is 1220422439. The next prime is 1220422519. The reversal of 1220422451 is 1542240221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220422451 - 2¹⁰ = 1220421427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220421451) 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, 323921 + ... + 327666.

It is an arithmetic number, because the mean of its divisors is an integer number (305268978).

Almost surely, 2^1220422451 is an apocalyptic number.

1220422451 is a deficient number, since it is larger than the sum of its proper divisors (653461).

1220422451 is an equidigital number, since it uses as much as digits as its factorization.

1220422451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653460.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1220422451 is about 34934.5452382023. The cubic root of 1220422451 is about 1068.6530496463.

Adding to 1220422451 its reverse (1542240221), we get a palindrome (2762662672).

The spelling of 1220422451 in words is "one billion, two hundred twenty million, four hundred twenty-two thousand, four hundred fifty-one".