1011209971 has 2 divisors, whose sum is σ = 1011209972. Its totient is φ = 1011209970.

The previous prime is 1011209939. The next prime is 1011210023. The reversal of 1011209971 is 1799021101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1011209971 - 2⁵ = 1011209939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011509971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505604985 + 505604986.

It is an arithmetic number, because the mean of its divisors is an integer number (505604986).

Almost surely, 2^1011209971 is an apocalyptic number.

1011209971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011209971 is an equidigital number, since it uses as much as digits as its factorization.

1011209971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 1011209971 is about 31799.5278424067. The cubic root of 1011209971 is about 1003.7227807057.

The spelling of 1011209971 in words is "one billion, eleven million, two hundred nine thousand, nine hundred seventy-one".