1031121431 has 4 divisors (see below), whose sum is σ = 1085391000. Its totient is φ = 976851864.

The previous prime is 1031121397. The next prime is 1031121437. The reversal of 1031121431 is 1341211301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1341211301 = 6469 ⋅207329.

It is a de Polignac number, because none of the positive numbers 2^k-1031121431 is a prime.

It is a super-2 number, since 2×1031121431² = 2126422810934975522, 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 (1031121437) 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, 27134756 + ... + 27134793.

It is an arithmetic number, because the mean of its divisors is an integer number (271347750).

Almost surely, 2^1031121431 is an apocalyptic number.

1031121431 is a deficient number, since it is larger than the sum of its proper divisors (54269569).

1031121431 is an equidigital number, since it uses as much as digits as its factorization.

1031121431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54269568.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1031121431 is about 32111.0795676508. The cubic root of 1031121431 is about 1010.2680172944.

Adding to 1031121431 its reverse (1341211301), we get a palindrome (2372332732).

The spelling of 1031121431 in words is "one billion, thirty-one million, one hundred twenty-one thousand, four hundred thirty-one".