30551 has 4 divisors (see below), whose sum is σ = 30912. Its totient is φ = 30192.

The previous prime is 30539. The next prime is 30553. The reversal of 30551 is 15503.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15503 = 37 ⋅419.

It is a cyclic number.

It is not a de Polignac number, because 30551 - 2¹⁰ = 29527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26 + ... + 248.

It is an arithmetic number, because the mean of its divisors is an integer number (7728).

2³⁰⁵⁵¹ is an apocalyptic number.

30551 is a deficient number, since it is larger than the sum of its proper divisors (361).

30551 is a wasteful number, since it uses less digits than its factorization.

30551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 75, while the sum is 14.

The square root of 30551 is about 174.7884435539. The cubic root of 30551 is about 31.2614038380.

The spelling of 30551 in words is "thirty thousand, five hundred fifty-one".