30513971 has 2 divisors, whose sum is σ = 30513972. Its totient is φ = 30513970.

The previous prime is 30513953. The next prime is 30513983. The reversal of 30513971 is 17931503.

It is a strong prime.

It is an emirp because it is prime and its reverse (17931503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30513971 - 2¹⁴ = 30497587 is a prime.

It is a super-2 number, since 2×30513971² = 1862204852377682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30513911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15256985 + 15256986.

It is an arithmetic number, because the mean of its divisors is an integer number (15256986).

Almost surely, 2^30513971 is an apocalyptic number.

30513971 is a deficient number, since it is larger than the sum of its proper divisors (1).

30513971 is an equidigital number, since it uses as much as digits as its factorization.

30513971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 29.

The square root of 30513971 is about 5523.9452386858. The cubic root of 30513971 is about 312.4876871949.

The spelling of 30513971 in words is "thirty million, five hundred thirteen thousand, nine hundred seventy-one".