261436031 has 2 divisors, whose sum is σ = 261436032. Its totient is φ = 261436030.

The previous prime is 261436027. The next prime is 261436039. The reversal of 261436031 is 130634162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261436031 - 2² = 261436027 is a prime.

It is a super-2 number, since 2×261436031² = 136697596610065922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261436039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130718015 + 130718016.

It is an arithmetic number, because the mean of its divisors is an integer number (130718016).

Almost surely, 2^261436031 is an apocalyptic number.

261436031 is a deficient number, since it is larger than the sum of its proper divisors (1).

261436031 is an equidigital number, since it uses as much as digits as its factorization.

261436031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 261436031 is about 16168.9836106046. The cubic root of 261436031 is about 639.4233339093.

The spelling of 261436031 in words is "two hundred sixty-one million, four hundred thirty-six thousand, thirty-one".