261896039 has 2 divisors, whose sum is σ = 261896040. Its totient is φ = 261896038.

The previous prime is 261896003. The next prime is 261896051. The reversal of 261896039 is 930698162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261896039 - 2²⁰ = 260847463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261896059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130948019 + 130948020.

It is an arithmetic number, because the mean of its divisors is an integer number (130948020).

Almost surely, 2^261896039 is an apocalyptic number.

261896039 is a deficient number, since it is larger than the sum of its proper divisors (1).

261896039 is an equidigital number, since it uses as much as digits as its factorization.

261896039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 261896039 is about 16183.2023715951. The cubic root of 261896039 is about 639.7981451637.

The spelling of 261896039 in words is "two hundred sixty-one million, eight hundred ninety-six thousand, thirty-nine".