261515342 has 16 divisors (see below), whose sum is σ = 428544432. Its totient is φ = 118701120.

The previous prime is 261515339. The next prime is 261515347. The reversal of 261515342 is 243515162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261515347) 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, 8018 + ... + 24234.

It is an arithmetic number, because the mean of its divisors is an integer number (26784027).

Almost surely, 2^261515342 is an apocalyptic number.

261515342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261515342 is a deficient number, since it is larger than the sum of its proper divisors (167029090).

261515342 is a wasteful number, since it uses less digits than its factorization.

261515342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16963.

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

The square root of 261515342 is about 16171.4359906596. The cubic root of 261515342 is about 639.4879872988.

The spelling of 261515342 in words is "two hundred sixty-one million, five hundred fifteen thousand, three hundred forty-two".