551431603 has 2 divisors, whose sum is σ = 551431604. Its totient is φ = 551431602.

The previous prime is 551431597. The next prime is 551431633. The reversal of 551431603 is 306134155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551431603 - 2²¹ = 549334451 is a prime.

It is not a weakly prime, because it can be changed into another prime (551431633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275715801 + 275715802.

It is an arithmetic number, because the mean of its divisors is an integer number (275715802).

Almost surely, 2^551431603 is an apocalyptic number.

551431603 is a deficient number, since it is larger than the sum of its proper divisors (1).

551431603 is an equidigital number, since it uses as much as digits as its factorization.

551431603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 551431603 is about 23482.5808419773. The cubic root of 551431603 is about 820.0315291268.

Adding to 551431603 its reverse (306134155), we get a palindrome (857565758).

The spelling of 551431603 in words is "five hundred fifty-one million, four hundred thirty-one thousand, six hundred three".