551615 has 4 divisors (see below), whose sum is σ = 661944. Its totient is φ = 441288.

The previous prime is 551597. The next prime is 551651. The reversal of 551615 is 516155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 516155 = 5 ⋅103231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551615 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55157 + ... + 55166.

It is an arithmetic number, because the mean of its divisors is an integer number (165486).

2⁵⁵¹⁶¹⁵ is an apocalyptic number.

551615 is a deficient number, since it is larger than the sum of its proper divisors (110329).

551615 is a wasteful number, since it uses less digits than its factorization.

551615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110328.

The product of its digits is 750, while the sum is 23.

The square root of 551615 is about 742.7078833566. The cubic root of 551615 is about 82.0122428676.

The spelling of 551615 in words is "five hundred fifty-one thousand, six hundred fifteen".