261624337 has 6 divisors (see below), whose sum is σ = 283297542. Its totient is φ = 241499232.

The previous prime is 261624331. The next prime is 261624343. The reversal of 261624337 is 733426162.

It is an interprime number because it is at equal distance from previous prime (261624331) and next prime (261624343).

It can be written as a sum of positive squares in 3 ways, for example, as 1640961 + 259983376 = 1281^2 + 16124^2 .

It is not a de Polignac number, because 261624337 - 2¹⁵ = 261591569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261624331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 773868 + ... + 774205.

It is an arithmetic number, because the mean of its divisors is an integer number (47216257).

Almost surely, 2^261624337 is an apocalyptic number.

It is an amenable number.

261624337 is a deficient number, since it is larger than the sum of its proper divisors (21673205).

261624337 is a wasteful number, since it uses less digits than its factorization.

261624337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548099 (or 1548086 counting only the distinct ones).

The product of its digits is 36288, while the sum is 34.

The square root of 261624337 is about 16174.8056247981. The cubic root of 261624337 is about 639.5768174117.

The spelling of 261624337 in words is "two hundred sixty-one million, six hundred twenty-four thousand, three hundred thirty-seven".