30988051 has 4 divisors (see below), whose sum is σ = 31123600. Its totient is φ = 30852504.

The previous prime is 30988049. The next prime is 30988057. The reversal of 30988051 is 15088903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15088903 = 29 ⋅520307.

It is a cyclic number.

It is not a de Polignac number, because 30988051 - 2¹ = 30988049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30987998 and 30988016.

It is not an unprimeable number, because it can be changed into a prime (30988057) 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, 67431 + ... + 67888.

It is an arithmetic number, because the mean of its divisors is an integer number (7780900).

Almost surely, 2^30988051 is an apocalyptic number.

30988051 is the 2490-th centered decagonal number.

30988051 is a deficient number, since it is larger than the sum of its proper divisors (135549).

30988051 is a wasteful number, since it uses less digits than its factorization.

30988051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135548.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 30988051 is about 5566.6912075307. The cubic root of 30988051 is about 314.0976983776.

The spelling of 30988051 in words is "thirty million, nine hundred eighty-eight thousand, fifty-one".