261135542 has 16 divisors (see below), whose sum is σ = 397513440. Its totient is φ = 128644992.

The previous prime is 261135541. The next prime is 261135557. The reversal of 261135542 is 245531162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261135541) 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, 35759 + ... + 42437.

It is an arithmetic number, because the mean of its divisors is an integer number (24844590).

Almost surely, 2^261135542 is an apocalyptic number.

261135542 is a deficient number, since it is larger than the sum of its proper divisors (136377898).

261135542 is a wasteful number, since it uses less digits than its factorization.

261135542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6967.

The product of its digits is 7200, while the sum is 29.

The square root of 261135542 is about 16159.6887965084. The cubic root of 261135542 is about 639.1782601421.

The spelling of 261135542 in words is "two hundred sixty-one million, one hundred thirty-five thousand, five hundred forty-two".