261854877 has 4 divisors (see below), whose sum is σ = 349139840. Its totient is φ = 174569916.

The previous prime is 261854837. The next prime is 261854881. The reversal of 261854877 is 778458162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-261854877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261854837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43642477 + ... + 43642482.

It is an arithmetic number, because the mean of its divisors is an integer number (87284960).

Almost surely, 2^261854877 is an apocalyptic number.

It is an amenable number.

261854877 is a deficient number, since it is larger than the sum of its proper divisors (87284963).

261854877 is an equidigital number, since it uses as much as digits as its factorization.

261854877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87284962.

The product of its digits is 752640, while the sum is 48.

The square root of 261854877 is about 16181.9305708559. The cubic root of 261854877 is about 639.7646245459.

The spelling of 261854877 in words is "two hundred sixty-one million, eight hundred fifty-four thousand, eight hundred seventy-seven".