145252421 has 2 divisors, whose sum is σ = 145252422. Its totient is φ = 145252420.

The previous prime is 145252363. The next prime is 145252427. The reversal of 145252421 is 124252541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142324900 + 2927521 = 11930^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 145252421 - 2¹⁴ = 145236037 is a prime.

It is a super-2 number, since 2×145252421² = 42196531612722482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145252427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72626210 + 72626211.

It is an arithmetic number, because the mean of its divisors is an integer number (72626211).

Almost surely, 2^145252421 is an apocalyptic number.

It is an amenable number.

145252421 is a deficient number, since it is larger than the sum of its proper divisors (1).

145252421 is an equidigital number, since it uses as much as digits as its factorization.

145252421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 26.

The square root of 145252421 is about 12052.0712327799. The cubic root of 145252421 is about 525.6634647508.

The spelling of 145252421 in words is "one hundred forty-five million, two hundred fifty-two thousand, four hundred twenty-one".