102440431 has 2 divisors, whose sum is σ = 102440432. Its totient is φ = 102440430.

The previous prime is 102440407. The next prime is 102440473. The reversal of 102440431 is 134044201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102440431 - 2¹¹ = 102438383 is a prime.

It is a super-2 number, since 2×102440431² = 20988083806931522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102440399 and 102440408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102440131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51220215 + 51220216.

It is an arithmetic number, because the mean of its divisors is an integer number (51220216).

Almost surely, 2^102440431 is an apocalyptic number.

102440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

102440431 is an equidigital number, since it uses as much as digits as its factorization.

102440431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 102440431 is about 10121.2860348871. The cubic root of 102440431 is about 467.9044034294.

Adding to 102440431 its reverse (134044201), we get a palindrome (236484632).

The spelling of 102440431 in words is "one hundred two million, four hundred forty thousand, four hundred thirty-one".