261416531 has 8 divisors (see below), whose sum is σ = 276976224. Its totient is φ = 245877120.

The previous prime is 261416503. The next prime is 261416539. The reversal of 261416531 is 135614162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261416531 - 2¹⁴ = 261400147 is a prime.

It is a super-2 number, since 2×261416531² = 136677205360147922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261416494 and 261416503.

It is not an unprimeable number, because it can be changed into a prime (261416539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27506 + ... + 35768.

It is an arithmetic number, because the mean of its divisors is an integer number (34622028).

Almost surely, 2^261416531 is an apocalyptic number.

261416531 is a deficient number, since it is larger than the sum of its proper divisors (15559693).

261416531 is a wasteful number, since it uses less digits than its factorization.

261416531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141.

The product of its digits is 4320, while the sum is 29.

The square root of 261416531 is about 16168.3805929969. The cubic root of 261416531 is about 639.4074357372.

The spelling of 261416531 in words is "two hundred sixty-one million, four hundred sixteen thousand, five hundred thirty-one".