1321032131 has 4 divisors (see below), whose sum is σ = 1322984112. Its totient is φ = 1319080152.

The previous prime is 1321032103. The next prime is 1321032137. The reversal of 1321032131 is 1312301231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1312301231 = 1867 ⋅702893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321032131 is a prime.

It is a super-2 number, since 2×1321032131² = 3490251782268802322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321032137) 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, 974975 + ... + 976328.

It is an arithmetic number, because the mean of its divisors is an integer number (330746028).

Almost surely, 2^1321032131 is an apocalyptic number.

1321032131 is a deficient number, since it is larger than the sum of its proper divisors (1951981).

1321032131 is an equidigital number, since it uses as much as digits as its factorization.

1321032131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951980.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1321032131 is about 36346.0057090184. The cubic root of 1321032131 is about 1097.2471470534.

Adding to 1321032131 its reverse (1312301231), we get a palindrome (2633333362).

The spelling of 1321032131 in words is "one billion, three hundred twenty-one million, thirty-two thousand, one hundred thirty-one".