261971358 has 16 divisors (see below), whose sum is σ = 571574016. Its totient is φ = 79385240.

The previous prime is 261971341. The next prime is 261971371. The reversal of 261971358 is 853179162.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1984566 + ... + 1984697.

It is an arithmetic number, because the mean of its divisors is an integer number (35723376).

Almost surely, 2^261971358 is an apocalyptic number.

261971358 is an abundant number, since it is smaller than the sum of its proper divisors (309602658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261971358 is a wasteful number, since it uses less digits than its factorization.

261971358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969279.

The product of its digits is 90720, while the sum is 42.

The square root of 261971358 is about 16185.5292777221. The cubic root of 261971358 is about 639.8594727269.

The spelling of 261971358 in words is "two hundred sixty-one million, nine hundred seventy-one thousand, three hundred fifty-eight".