145355261 has 4 divisors (see below), whose sum is σ = 146794524. Its totient is φ = 143916000.

The previous prime is 145355237. The next prime is 145355269. The reversal of 145355261 is 162553541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119028100 + 26327161 = 10910^2 + 5131^2 .

It is a cyclic number.

It is not a de Polignac number, because 145355261 - 2¹⁴ = 145338877 is a prime.

It is a super-2 number, since 2×145355261² = 42256303800756242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145355269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719480 + ... + 719681.

It is an arithmetic number, because the mean of its divisors is an integer number (36698631).

Almost surely, 2^145355261 is an apocalyptic number.

It is an amenable number.

145355261 is a deficient number, since it is larger than the sum of its proper divisors (1439263).

145355261 is a wasteful number, since it uses less digits than its factorization.

145355261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439262.

The product of its digits is 18000, while the sum is 32.

The square root of 145355261 is about 12056.3369644349. The cubic root of 145355261 is about 525.7874936132.

The spelling of 145355261 in words is "one hundred forty-five million, three hundred fifty-five thousand, two hundred sixty-one".