145342121 has 2 divisors, whose sum is σ = 145342122. Its totient is φ = 145342120.

The previous prime is 145342117. The next prime is 145342133. The reversal of 145342121 is 121243541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131354521 + 13987600 = 11461^2 + 3740^2 .

It is a cyclic number.

It is not a de Polignac number, because 145342121 - 2² = 145342117 is a prime.

It is a super-2 number, since 2×145342121² = 42248664273557282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (145342111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72671060 + 72671061.

It is an arithmetic number, because the mean of its divisors is an integer number (72671061).

Almost surely, 2^145342121 is an apocalyptic number.

It is an amenable number.

145342121 is a deficient number, since it is larger than the sum of its proper divisors (1).

145342121 is an equidigital number, since it uses as much as digits as its factorization.

145342121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 145342121 is about 12055.7920104819. The cubic root of 145342121 is about 525.7716495453.

Adding to 145342121 its reverse (121243541), we get a palindrome (266585662).

The spelling of 145342121 in words is "one hundred forty-five million, three hundred forty-two thousand, one hundred twenty-one".