30961691 has 2 divisors, whose sum is σ = 30961692. Its totient is φ = 30961690.

The previous prime is 30961681. The next prime is 30961729. The reversal of 30961691 is 19616903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30961691 - 2¹⁴ = 30945307 is a prime.

It is not a weakly prime, because it can be changed into another prime (30961681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15480845 + 15480846.

It is an arithmetic number, because the mean of its divisors is an integer number (15480846).

Almost surely, 2^30961691 is an apocalyptic number.

30961691 is a deficient number, since it is larger than the sum of its proper divisors (1).

30961691 is an equidigital number, since it uses as much as digits as its factorization.

30961691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 30961691 is about 5564.3230495722. The cubic root of 30961691 is about 314.0086106609.

The spelling of 30961691 in words is "thirty million, nine hundred sixty-one thousand, six hundred ninety-one".