145425421 has 2 divisors, whose sum is σ = 145425422. Its totient is φ = 145425420.

The previous prime is 145425409. The next prime is 145425451. The reversal of 145425421 is 124524541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145082025 + 343396 = 12045^2 + 586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145425421 is a prime.

It is a super-2 number, since 2×145425421² = 42297106146054482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145425421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145425451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72712710 + 72712711.

It is an arithmetic number, because the mean of its divisors is an integer number (72712711).

Almost surely, 2^145425421 is an apocalyptic number.

It is an amenable number.

145425421 is a deficient number, since it is larger than the sum of its proper divisors (1).

145425421 is an equidigital number, since it uses as much as digits as its factorization.

145425421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 28.

The square root of 145425421 is about 12059.2462865637. The cubic root of 145425421 is about 525.8720756151.

Adding to 145425421 its reverse (124524541), we get a palindrome (269949962).

The spelling of 145425421 in words is "one hundred forty-five million, four hundred twenty-five thousand, four hundred twenty-one".