551401643 has 8 divisors (see below), whose sum is σ = 594826848. Its totient is φ = 508120704.

The previous prime is 551401633. The next prime is 551401649. The reversal of 551401643 is 346104155.

It is a happy number.

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

It is not a de Polignac number, because 551401643 - 2¹² = 551397547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551401649) 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, 28055 + ... + 43472.

It is an arithmetic number, because the mean of its divisors is an integer number (74353356).

Almost surely, 2^551401643 is an apocalyptic number.

551401643 is a deficient number, since it is larger than the sum of its proper divisors (43425205).

551401643 is a wasteful number, since it uses less digits than its factorization.

551401643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72133.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 551401643 is about 23481.9429136518. The cubic root of 551401643 is about 820.0166777294.

Adding to 551401643 its reverse (346104155), we get a palindrome (897505798).

The spelling of 551401643 in words is "five hundred fifty-one million, four hundred one thousand, six hundred forty-three".