551623403 has 2 divisors, whose sum is σ = 551623404. Its totient is φ = 551623402.

The previous prime is 551623379. The next prime is 551623411. The reversal of 551623403 is 304326155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 551623403 - 2¹⁴ = 551607019 is a prime.

It is not a weakly prime, because it can be changed into another prime (551623493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275811701 + 275811702.

It is an arithmetic number, because the mean of its divisors is an integer number (275811702).

Almost surely, 2^551623403 is an apocalyptic number.

551623403 is a deficient number, since it is larger than the sum of its proper divisors (1).

551623403 is an equidigital number, since it uses as much as digits as its factorization.

551623403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 551623403 is about 23486.6643651243. The cubic root of 551623403 is about 820.1265930867.

Adding to 551623403 its reverse (304326155), we get a palindrome (855949558).

The spelling of 551623403 in words is "five hundred fifty-one million, six hundred twenty-three thousand, four hundred three".