145421251 has 2 divisors, whose sum is σ = 145421252. Its totient is φ = 145421250.

The previous prime is 145421233. The next prime is 145421257. The reversal of 145421251 is 152124541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145421251 - 2⁷ = 145421123 is a prime.

It is a super-2 number, since 2×145421251² = 42294680484810002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145421257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72710625 + 72710626.

It is an arithmetic number, because the mean of its divisors is an integer number (72710626).

Almost surely, 2^145421251 is an apocalyptic number.

145421251 is a deficient number, since it is larger than the sum of its proper divisors (1).

145421251 is an equidigital number, since it uses as much as digits as its factorization.

145421251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 25.

The square root of 145421251 is about 12059.0733889466. The cubic root of 145421251 is about 525.8670491956.

Adding to 145421251 its reverse (152124541), we get a palindrome (297545792).

The spelling of 145421251 in words is "one hundred forty-five million, four hundred twenty-one thousand, two hundred fifty-one".