1245223551 has 32 divisors (see below), whose sum is σ = 1964890368. Its totient is φ = 691511040.

The previous prime is 1245223549. The next prime is 1245223559. The reversal of 1245223551 is 1553225421.

It is not a de Polignac number, because 1245223551 - 2¹ = 1245223549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245223559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48180 + ... + 69366.

It is an arithmetic number, because the mean of its divisors is an integer number (61402824).

Almost surely, 2^1245223551 is an apocalyptic number.

1245223551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1245223551 is a deficient number, since it is larger than the sum of its proper divisors (719666817).

1245223551 is a wasteful number, since it uses less digits than its factorization.

1245223551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21351.

The product of its digits is 12000, while the sum is 30.

The square root of 1245223551 is about 35287.7252171346. The cubic root of 1245223551 is about 1075.8435206706.

Adding to 1245223551 its reverse (1553225421), we get a palindrome (2798448972).

The spelling of 1245223551 in words is "one billion, two hundred forty-five million, two hundred twenty-three thousand, five hundred fifty-one".