1000209129931 has 4 divisors (see below), whose sum is σ = 1091137232664. Its totient is φ = 909281027200.

The previous prime is 1000209129917. The next prime is 1000209129979. The reversal of 1000209129931 is 1399219020001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1000209129931 - 2²⁷ = 1000074912203 is a prime.

It is a super-2 number, since 2×1000209129931² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000209123931) 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, 45464051350 + ... + 45464051371.

It is an arithmetic number, because the mean of its divisors is an integer number (272784308166).

Almost surely, 2^{1000209129931} is an apocalyptic number.

1000209129931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1000209129931 is a deficient number, since it is larger than the sum of its proper divisors (90928102733).

1000209129931 is an equidigital number, since it uses as much as digits as its factorization.

1000209129931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90928102732.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 1000209129931 in words is "one trillion, two hundred nine million, one hundred twenty-nine thousand, nine hundred thirty-one".