30625561 has 4 divisors (see below), whose sum is σ = 30742272. Its totient is φ = 30508852.

The previous prime is 30625547. The next prime is 30625577. The reversal of 30625561 is 16552603.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16552603 = 241 ⋅68683.

It is a cyclic number.

It is not a de Polignac number, because 30625561 - 2¹³ = 30617369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30625541) 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, 57961 + ... + 58486.

It is an arithmetic number, because the mean of its divisors is an integer number (7685568).

Almost surely, 2^30625561 is an apocalyptic number.

It is an amenable number.

30625561 is a deficient number, since it is larger than the sum of its proper divisors (116711).

30625561 is a wasteful number, since it uses less digits than its factorization.

30625561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116710.

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

The square root of 30625561 is about 5534.0365918559. The cubic root of 30625561 is about 312.8681476717.

The spelling of 30625561 in words is "thirty million, six hundred twenty-five thousand, five hundred sixty-one".