261503671 has 24 divisors (see below), whose sum is σ = 311164416. Its totient is φ = 217844640.

The previous prime is 261503663. The next prime is 261503677. The reversal of 261503671 is 176305162.

It is not a de Polignac number, because 261503671 - 2³ = 261503663 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 (261503677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302586 + ... + 303448.

It is an arithmetic number, because the mean of its divisors is an integer number (12965184).

Almost surely, 2^261503671 is an apocalyptic number.

261503671 is a deficient number, since it is larger than the sum of its proper divisors (49660745).

261503671 is a wasteful number, since it uses less digits than its factorization.

261503671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1050 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 261503671 is about 16171.0751343255. The cubic root of 261503671 is about 639.4784740579.

The spelling of 261503671 in words is "two hundred sixty-one million, five hundred three thousand, six hundred seventy-one".