1009901111 has 4 divisors (see below), whose sum is σ = 1010056824. Its totient is φ = 1009745400.

The previous prime is 1009901107. The next prime is 1009901119. The reversal of 1009901111 is 1111099001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111099001 = 947 ⋅1173283.

It is a cyclic number.

It is not a de Polignac number, because 1009901111 - 2² = 1009901107 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 (1009901119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67685 + ... + 81246.

It is an arithmetic number, because the mean of its divisors is an integer number (252514206).

Almost surely, 2^1009901111 is an apocalyptic number.

1009901111 is a deficient number, since it is larger than the sum of its proper divisors (155713).

1009901111 is an equidigital number, since it uses as much as digits as its factorization.

1009901111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155712.

The product of its (nonzero) digits is 81, while the sum is 23.

The square root of 1009901111 is about 31778.9413133918. The cubic root of 1009901111 is about 1003.2895374115.

The spelling of 1009901111 in words is "one billion, nine million, nine hundred one thousand, one hundred eleven".