30897961 has 4 divisors (see below), whose sum is σ = 30921300. Its totient is φ = 30874624.

The previous prime is 30897953. The next prime is 30897983. The reversal of 30897961 is 16979803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16979803 = 211 ⋅80473.

It can be written as a sum of positive squares in 2 ways, for example, as 16152361 + 14745600 = 4019^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 30897961 - 2³ = 30897953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30897991) 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, 9556 + ... + 12373.

It is an arithmetic number, because the mean of its divisors is an integer number (7730325).

Almost surely, 2^30897961 is an apocalyptic number.

It is an amenable number.

30897961 is a deficient number, since it is larger than the sum of its proper divisors (23339).

30897961 is a wasteful number, since it uses less digits than its factorization.

30897961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23338.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 30897961 is about 5558.5934371925. The cubic root of 30897961 is about 313.7930161176.

The spelling of 30897961 in words is "thirty million, eight hundred ninety-seven thousand, nine hundred sixty-one".