145483721 has 2 divisors, whose sum is σ = 145483722. Its totient is φ = 145483720.

The previous prime is 145483693. The next prime is 145483729. The reversal of 145483721 is 127384541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105288121 + 40195600 = 10261^2 + 6340^2 .

It is an emirp because it is prime and its reverse (127384541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145483721 - 2¹⁰ = 145482697 is a prime.

It is not a weakly prime, because it can be changed into another prime (145483729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72741860 + 72741861.

It is an arithmetic number, because the mean of its divisors is an integer number (72741861).

Almost surely, 2^145483721 is an apocalyptic number.

It is an amenable number.

145483721 is a deficient number, since it is larger than the sum of its proper divisors (1).

145483721 is an equidigital number, since it uses as much as digits as its factorization.

145483721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 145483721 is about 12061.6632766795. The cubic root of 145483721 is about 525.9423389978.

The spelling of 145483721 in words is "one hundred forty-five million, four hundred eighty-three thousand, seven hundred twenty-one".