30703991 has 8 divisors (see below), whose sum is σ = 31135104. Its totient is φ = 30275640.

The previous prime is 30703949. The next prime is 30703993. The reversal of 30703991 is 19930703.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30703991 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 (30703993) 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 7 ways as a sum of consecutive naturals, for example, 31136 + ... + 32106.

It is an arithmetic number, because the mean of its divisors is an integer number (3891888).

Almost surely, 2^30703991 is an apocalyptic number.

30703991 is a deficient number, since it is larger than the sum of its proper divisors (431113).

30703991 is a wasteful number, since it uses less digits than its factorization.

30703991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 5103, while the sum is 32.

The square root of 30703991 is about 5541.1182084485. The cubic root of 30703991 is about 313.1349980938.

The spelling of 30703991 in words is "thirty million, seven hundred three thousand, nine hundred ninety-one".