2131223309 has 16 divisors (see below), whose sum is σ = 2430673920. Its totient is φ = 1856743680.

The previous prime is 2131223291. The next prime is 2131223317. The reversal of 2131223309 is 9033221312.

It is a cyclic number.

It is not a de Polignac number, because 2131223309 - 2¹⁶ = 2131157773 is a prime.

It is a super-2 number, since 2×2131223309² = 9084225585649818962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131223329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75794 + ... + 100035.

It is an arithmetic number, because the mean of its divisors is an integer number (151917120).

Almost surely, 2^2131223309 is an apocalyptic number.

It is an amenable number.

2131223309 is a deficient number, since it is larger than the sum of its proper divisors (299450611).

2131223309 is a wasteful number, since it uses less digits than its factorization.

2131223309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175900.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 2131223309 is about 46165.1742009060. The cubic root of 2131223309 is about 1286.8946215339.

The spelling of 2131223309 in words is "two billion, one hundred thirty-one million, two hundred twenty-three thousand, three hundred nine".