261493937 has 2 divisors, whose sum is σ = 261493938. Its totient is φ = 261493936.

The previous prime is 261493933. The next prime is 261493951. The reversal of 261493937 is 739394162.

261493937 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249355681 + 12138256 = 15791^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 261493937 - 2² = 261493933 is a prime.

It is not a weakly prime, because it can be changed into another prime (261493931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130746968 + 130746969.

It is an arithmetic number, because the mean of its divisors is an integer number (130746969).

Almost surely, 2^261493937 is an apocalyptic number.

It is an amenable number.

261493937 is a deficient number, since it is larger than the sum of its proper divisors (1).

261493937 is an equidigital number, since it uses as much as digits as its factorization.

261493937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 261493937 is about 16170.7741620493. The cubic root of 261493937 is about 639.4705394839.

The spelling of 261493937 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred thirty-seven".