145722431 has 2 divisors, whose sum is σ = 145722432. Its totient is φ = 145722430.

The previous prime is 145722407. The next prime is 145722433. The reversal of 145722431 is 134227541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145722431 - 2¹⁴ = 145706047 is a prime.

It is a super-2 number, since 2×145722431² = 42470053793099522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 145722433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145722394 and 145722403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145722433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72861215 + 72861216.

It is an arithmetic number, because the mean of its divisors is an integer number (72861216).

Almost surely, 2^145722431 is an apocalyptic number.

145722431 is a deficient number, since it is larger than the sum of its proper divisors (1).

145722431 is an equidigital number, since it uses as much as digits as its factorization.

145722431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 29.

The square root of 145722431 is about 12071.5546223343. The cubic root of 145722431 is about 526.2298375832.

Adding to 145722431 its reverse (134227541), we get a palindrome (279949972).

The spelling of 145722431 in words is "one hundred forty-five million, seven hundred twenty-two thousand, four hundred thirty-one".