1210209131 has 4 divisors (see below), whose sum is σ = 1210341264. Its totient is φ = 1210077000.

The previous prime is 1210209127. The next prime is 1210209149. The reversal of 1210209131 is 1319020121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1319020121 = 523 ⋅2522027.

It is a cyclic number.

It is not a de Polignac number, because 1210209131 - 2² = 1210209127 is a prime.

It is a super-2 number, since 2×1210209131² = 2929212281511550322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210203131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51215 + ... + 71016.

It is an arithmetic number, because the mean of its divisors is an integer number (302585316).

Almost surely, 2^1210209131 is an apocalyptic number.

1210209131 is a deficient number, since it is larger than the sum of its proper divisors (132133).

1210209131 is an equidigital number, since it uses as much as digits as its factorization.

1210209131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132132.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1210209131 is about 34788.0601787452. The cubic root of 1210209131 is about 1065.6636245418.

Adding to 1210209131 its reverse (1319020121), we get a palindrome (2529229252).

The spelling of 1210209131 in words is "one billion, two hundred ten million, two hundred nine thousand, one hundred thirty-one".