1145326261 has 8 divisors (see below), whose sum is σ = 1254516120. Its totient is φ = 1040782848.

The previous prime is 1145326241. The next prime is 1145326271. The reversal of 1145326261 is 1626235411.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 547279236 + 598047025 = 23394^2 + 24455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1145326261 - 2⁵ = 1145326229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145326201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161096 + ... + 1162081.

It is an arithmetic number, because the mean of its divisors is an integer number (156814515).

Almost surely, 2^1145326261 is an apocalyptic number.

It is an amenable number.

1145326261 is a deficient number, since it is larger than the sum of its proper divisors (109189859).

1145326261 is a wasteful number, since it uses less digits than its factorization.

1145326261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323223.

The product of its digits is 8640, while the sum is 31.

The square root of 1145326261 is about 33842.6692357444. The cubic root of 1145326261 is about 1046.2683137403.

The spelling of 1145326261 in words is "one billion, one hundred forty-five million, three hundred twenty-six thousand, two hundred sixty-one".