1011509971 has 2 divisors, whose sum is σ = 1011509972. Its totient is φ = 1011509970.

The previous prime is 1011509969. The next prime is 1011509977. The reversal of 1011509971 is 1799051101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1011509971 - 2¹ = 1011509969 is a prime.

Together with 1011509969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1011509977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505754985 + 505754986.

It is an arithmetic number, because the mean of its divisors is an integer number (505754986).

Almost surely, 2^1011509971 is an apocalyptic number.

1011509971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011509971 is an equidigital number, since it uses as much as digits as its factorization.

1011509971 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 34.

The square root of 1011509971 is about 31804.2445437712. The cubic root of 1011509971 is about 1003.8220304724.

The spelling of 1011509971 in words is "one billion, eleven million, five hundred nine thousand, nine hundred seventy-one".