30873561 has 4 divisors (see below), whose sum is σ = 41164752. Its totient is φ = 20582372.

The previous prime is 30873559. The next prime is 30873599. The reversal of 30873561 is 16537803.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30873561 - 2¹ = 30873559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30873511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5145591 + ... + 5145596.

It is an arithmetic number, because the mean of its divisors is an integer number (10291188).

Almost surely, 2^30873561 is an apocalyptic number.

It is an amenable number.

30873561 is a deficient number, since it is larger than the sum of its proper divisors (10291191).

30873561 is a wasteful number, since it uses less digits than its factorization.

30873561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10291190.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 30873561 is about 5556.3982038727. The cubic root of 30873561 is about 313.7103939889.

The spelling of 30873561 in words is "thirty million, eight hundred seventy-three thousand, five hundred sixty-one".