1234455551 has 4 divisors (see below), whose sum is σ = 1410806352. Its totient is φ = 1058104752.

The previous prime is 1234455539. The next prime is 1234455559. The reversal of 1234455551 is 1555544321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555544321 = 23447 ⋅66343.

It is a cyclic number.

It is not a de Polignac number, because 1234455551 - 2²² = 1230261247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234455559) 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, 88175390 + ... + 88175403.

It is an arithmetic number, because the mean of its divisors is an integer number (352701588).

Almost surely, 2^1234455551 is an apocalyptic number.

1234455551 is a deficient number, since it is larger than the sum of its proper divisors (176350801).

1234455551 is an equidigital number, since it uses as much as digits as its factorization.

1234455551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176350800.

The product of its digits is 60000, while the sum is 35.

The square root of 1234455551 is about 35134.8196380741. The cubic root of 1234455551 is about 1072.7334400203.

Adding to 1234455551 its reverse (1555544321), we get a palindrome (2789999872).

The spelling of 1234455551 in words is "one billion, two hundred thirty-four million, four hundred fifty-five thousand, five hundred fifty-one".