145821601 has 2 divisors, whose sum is σ = 145821602. Its totient is φ = 145821600.

The previous prime is 145821581. The next prime is 145821619. The reversal of 145821601 is 106128541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116661601 + 29160000 = 10801^2 + 5400^2 .

It is a cyclic number.

It is not a de Polignac number, because 145821601 - 2⁵ = 145821569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145821601.

It is not a weakly prime, because it can be changed into another prime (145821691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72910800 + 72910801.

It is an arithmetic number, because the mean of its divisors is an integer number (72910801).

Almost surely, 2^145821601 is an apocalyptic number.

It is an amenable number.

145821601 is a deficient number, since it is larger than the sum of its proper divisors (1).

145821601 is an equidigital number, since it uses as much as digits as its factorization.

145821601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 145821601 is about 12075.6615139710. The cubic root of 145821601 is about 526.3491840669.

The spelling of 145821601 in words is "one hundred forty-five million, eight hundred twenty-one thousand, six hundred one".