145215401 has 2 divisors, whose sum is σ = 145215402. Its totient is φ = 145215400.

The previous prime is 145215391. The next prime is 145215403. The reversal of 145215401 is 104512541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 45914176 = 9965^2 + 6776^2 .

It is a cyclic number.

It is not a de Polignac number, because 145215401 - 2¹⁸ = 144953257 is a prime.

Together with 145215403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145215403) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72607700 + 72607701.

It is an arithmetic number, because the mean of its divisors is an integer number (72607701).

Almost surely, 2^145215401 is an apocalyptic number.

It is an amenable number.

145215401 is a deficient number, since it is larger than the sum of its proper divisors (1).

145215401 is an equidigital number, since it uses as much as digits as its factorization.

145215401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 145215401 is about 12050.5352993135. The cubic root of 145215401 is about 525.6188029251.

Adding to 145215401 its reverse (104512541), we get a palindrome (249727942).

The spelling of 145215401 in words is "one hundred forty-five million, two hundred fifteen thousand, four hundred one".