145718621 has 2 divisors, whose sum is σ = 145718622. Its totient is φ = 145718620.

The previous prime is 145718609. The next prime is 145718623. The reversal of 145718621 is 126817541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131354521 + 14364100 = 11461^2 + 3790^2 .

It is a cyclic number.

It is not a de Polignac number, because 145718621 - 2⁶ = 145718557 is a prime.

It is a super-2 number, since 2×145718621² = 42467833012283282, which contains 22 as substring.

Together with 145718623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145718623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72859310 + 72859311.

It is an arithmetic number, because the mean of its divisors is an integer number (72859311).

Almost surely, 2^145718621 is an apocalyptic number.

It is an amenable number.

145718621 is a deficient number, since it is larger than the sum of its proper divisors (1).

145718621 is an equidigital number, since it uses as much as digits as its factorization.

145718621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 145718621 is about 12071.3968122997. The cubic root of 145718621 is about 526.2252513454.

The spelling of 145718621 in words is "one hundred forty-five million, seven hundred eighteen thousand, six hundred twenty-one".