261456313110531 has 128 divisors (see below), whose sum is σ = 442385819910144. Its totient is φ = 133419000000000.

The previous prime is 261456313110529. The next prime is 261456313110583. The reversal of 261456313110531 is 135011313654162.

It is not a de Polignac number, because 261456313110531 - 2¹ = 261456313110529 is a prime.

It is a super-2 number, since 2×261456313110531² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261456313110521) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19013614906 + ... + 19013628656.

It is an arithmetic number, because the mean of its divisors is an integer number (3456139218048).

Almost surely, 2^{261456313110531} is an apocalyptic number.

261456313110531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

261456313110531 is a deficient number, since it is larger than the sum of its proper divisors (180929506799613).

261456313110531 is a wasteful number, since it uses less digits than its factorization.

261456313110531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20225.

The product of its (nonzero) digits is 194400, while the sum is 42.

Adding to 261456313110531 its reverse (135011313654162), we get a palindrome (396467626764693).

The spelling of 261456313110531 in words is "two hundred sixty-one trillion, four hundred fifty-six billion, three hundred thirteen million, one hundred ten thousand, five hundred thirty-one".