261414591 has 16 divisors (see below), whose sum is σ = 353860320. Its totient is φ = 171642240.

The previous prime is 261414557. The next prime is 261414653. The reversal of 261414591 is 195414162.

It is not a de Polignac number, because 261414591 - 2¹⁵ = 261381823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261414541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54261 + ... + 58881.

It is an arithmetic number, because the mean of its divisors is an integer number (22116270).

Almost surely, 2^261414591 is an apocalyptic number.

261414591 is a deficient number, since it is larger than the sum of its proper divisors (92445729).

261414591 is a wasteful number, since it uses less digits than its factorization.

261414591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906.

The product of its digits is 8640, while the sum is 33.

The square root of 261414591 is about 16168.3205992459. The cubic root of 261414591 is about 639.4058540296.

It can be divided in two parts, 2614 and 14591, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 261414591 in words is "two hundred sixty-one million, four hundred fourteen thousand, five hundred ninety-one".