145731431 has 2 divisors, whose sum is σ = 145731432. Its totient is φ = 145731430.

The previous prime is 145731413. The next prime is 145731479. The reversal of 145731431 is 134137541.

Together with previous prime (145731413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145731431 - 2⁶ = 145731367 is a prime.

It is a super-2 number, since 2×145731431² = 42475299962615522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145731394 and 145731403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145731491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72865715 + 72865716.

It is an arithmetic number, because the mean of its divisors is an integer number (72865716).

Almost surely, 2^145731431 is an apocalyptic number.

145731431 is a deficient number, since it is larger than the sum of its proper divisors (1).

145731431 is an equidigital number, since it uses as much as digits as its factorization.

145731431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 145731431 is about 12071.9273937512. The cubic root of 145731431 is about 526.2406708983.

Adding to 145731431 its reverse (134137541), we get a palindrome (279868972).

The spelling of 145731431 in words is "one hundred forty-five million, seven hundred thirty-one thousand, four hundred thirty-one".