30681157 has 4 divisors (see below), whose sum is σ = 33041260. Its totient is φ = 28321056.

The previous prime is 30681139. The next prime is 30681163. The reversal of 30681157 is 75118603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19351201 + 11329956 = 4399^2 + 3366^2 .

It is a cyclic number.

It is not a de Polignac number, because 30681157 - 2¹⁹ = 30156869 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 (30681127) 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, 1180032 + ... + 1180057.

It is an arithmetic number, because the mean of its divisors is an integer number (8260315).

Almost surely, 2^30681157 is an apocalyptic number.

It is an amenable number.

30681157 is a deficient number, since it is larger than the sum of its proper divisors (2360103).

30681157 is a wasteful number, since it uses less digits than its factorization.

30681157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360102.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 30681157 is about 5539.0574107875. The cubic root of 30681157 is about 313.0573545745.

It can be divided in two parts, 3068 and 1157, that added together give a square (4225 = 65²).

The spelling of 30681157 in words is "thirty million, six hundred eighty-one thousand, one hundred fifty-seven".