1501330261 has 4 divisors (see below), whose sum is σ = 1553100300. Its totient is φ = 1449560224.

The previous prime is 1501330249. The next prime is 1501330273. The reversal of 1501330261 is 1620331051.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1620331051 = 24533 ⋅66047.

It is an interprime number because it is at equal distance from previous prime (1501330249) and next prime (1501330273).

It can be written as a sum of positive squares in 2 ways, for example, as 772006225 + 729324036 = 27785^2 + 27006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1501330261 - 2⁷ = 1501330133 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 (1501330291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25884976 + ... + 25885033.

It is an arithmetic number, because the mean of its divisors is an integer number (388275075).

Almost surely, 2^1501330261 is an apocalyptic number.

It is an amenable number.

1501330261 is a deficient number, since it is larger than the sum of its proper divisors (51770039).

1501330261 is an equidigital number, since it uses as much as digits as its factorization.

1501330261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51770038.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1501330261 is about 38747.0032518645. The cubic root of 1501330261 is about 1145.0525356164.

The spelling of 1501330261 in words is "one billion, five hundred one million, three hundred thirty thousand, two hundred sixty-one".