1002123431 has 2 divisors, whose sum is σ = 1002123432. Its totient is φ = 1002123430.

The previous prime is 1002123389. The next prime is 1002123457. The reversal of 1002123431 is 1343212001.

It is a strong prime.

It is an emirp because it is prime and its reverse (1343212001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002123431 is a prime.

It is a super-2 number, since 2×1002123431² = 2008502741918423522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002122431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501061715 + 501061716.

It is an arithmetic number, because the mean of its divisors is an integer number (501061716).

Almost surely, 2^1002123431 is an apocalyptic number.

1002123431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002123431 is an equidigital number, since it uses as much as digits as its factorization.

1002123431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1002123431 is about 31656.3331894267. Note that the first 3 decimals coincide. The cubic root of 1002123431 is about 1000.7073099280.

Adding to 1002123431 its reverse (1343212001), we get a palindrome (2345335432).

The spelling of 1002123431 in words is "one billion, two million, one hundred twenty-three thousand, four hundred thirty-one".