261261037 has 2 divisors, whose sum is σ = 261261038. Its totient is φ = 261261036.

The previous prime is 261261019. The next prime is 261261053. The reversal of 261261037 is 730162162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243796996 + 17464041 = 15614^2 + 4179^2 .

It is a cyclic number.

It is not a de Polignac number, because 261261037 - 2¹¹ = 261258989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261260996 and 261261014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261261067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130630518 + 130630519.

It is an arithmetic number, because the mean of its divisors is an integer number (130630519).

Almost surely, 2^261261037 is an apocalyptic number.

It is an amenable number.

261261037 is a deficient number, since it is larger than the sum of its proper divisors (1).

261261037 is an equidigital number, since it uses as much as digits as its factorization.

261261037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 261261037 is about 16163.5712947356. The cubic root of 261261037 is about 639.2806346013.

The spelling of 261261037 in words is "two hundred sixty-one million, two hundred sixty-one thousand, thirty-seven".