261969371 has 16 divisors (see below), whose sum is σ = 280857600. Its totient is φ = 243492480.

The previous prime is 261969353. The next prime is 261969391. The reversal of 261969371 is 173969162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261969371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261969311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 713630 + ... + 713996.

It is an arithmetic number, because the mean of its divisors is an integer number (17553600).

Almost surely, 2^261969371 is an apocalyptic number.

261969371 is a deficient number, since it is larger than the sum of its proper divisors (18888229).

261969371 is a wasteful number, since it uses less digits than its factorization.

261969371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794.

The product of its digits is 122472, while the sum is 44.

The square root of 261969371 is about 16185.4678956155. The cubic root of 261969371 is about 639.8578549877.

The spelling of 261969371 in words is "two hundred sixty-one million, nine hundred sixty-nine thousand, three hundred seventy-one".