30945971 has 24 divisors (see below), whose sum is σ = 37851744. Its totient is φ = 24773760.

The previous prime is 30945961. The next prime is 30945973. The reversal of 30945971 is 17954903.

30945971 = T₂₉₇₀ + T₂₉₇₁ + ... + T₂₉₇₆.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-30945971 is a prime.

It is a super-2 number, since 2×30945971² = 1915306242265682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30945973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 225815 + ... + 225951.

It is an arithmetic number, because the mean of its divisors is an integer number (1577156).

Almost surely, 2^30945971 is an apocalyptic number.

30945971 is a deficient number, since it is larger than the sum of its proper divisors (6905773).

30945971 is a wasteful number, since it uses less digits than its factorization.

30945971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 30945971 is about 5562.9102994745. The cubic root of 30945971 is about 313.9554584067.

The spelling of 30945971 in words is "thirty million, nine hundred forty-five thousand, nine hundred seventy-one".