1145222431 has 4 divisors (see below), whose sum is σ = 1145345992. Its totient is φ = 1145098872.

The previous prime is 1145222411. The next prime is 1145222497. The reversal of 1145222431 is 1342225411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1342225411 = 3271 ⋅410341.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145222431 is a prime.

It is a super-2 number, since 2×1145222431² = 2623068832931099522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1145222396 and 1145222405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145222401) 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, 46641 + ... + 66826.

It is an arithmetic number, because the mean of its divisors is an integer number (286336498).

Almost surely, 2^1145222431 is an apocalyptic number.

1145222431 is a deficient number, since it is larger than the sum of its proper divisors (123561).

1145222431 is a wasteful number, since it uses less digits than its factorization.

1145222431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123560.

The product of its digits is 1920, while the sum is 25.

The square root of 1145222431 is about 33841.1351907704. The cubic root of 1145222431 is about 1046.2366961639.

Adding to 1145222431 its reverse (1342225411), we get a palindrome (2487447842).

The spelling of 1145222431 in words is "one billion, one hundred forty-five million, two hundred twenty-two thousand, four hundred thirty-one".