1223420251 has 8 divisors (see below), whose sum is σ = 1236358640. Its totient is φ = 1210513248.

The previous prime is 1223420243. The next prime is 1223420273. The reversal of 1223420251 is 1520243221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223420251 - 2³ = 1223420243 is a prime.

It is a super-2 number, since 2×1223420251² = 2993514221113806002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223423251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75100 + ... + 89926.

It is an arithmetic number, because the mean of its divisors is an integer number (154544830).

Almost surely, 2^1223420251 is an apocalyptic number.

1223420251 is a deficient number, since it is larger than the sum of its proper divisors (12938389).

1223420251 is a wasteful number, since it uses less digits than its factorization.

1223420251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15693.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1223420251 is about 34977.4248766258. The cubic root of 1223420251 is about 1069.5273339591.

Adding to 1223420251 its reverse (1520243221), we get a palindrome (2743663472).

The spelling of 1223420251 in words is "one billion, two hundred twenty-three million, four hundred twenty thousand, two hundred fifty-one".