261043502 has 8 divisors (see below), whose sum is σ = 391655736. Its totient is φ = 130491592.

The previous prime is 261043493. The next prime is 261043511. The reversal of 261043502 is 205340162.

It is an interprime number because it is at equal distance from previous prime (261043493) and next prime (261043511).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1988 + ... + 22935.

It is an arithmetic number, because the mean of its divisors is an integer number (48956967).

Almost surely, 2^261043502 is an apocalyptic number.

261043502 is a deficient number, since it is larger than the sum of its proper divisors (130612234).

261043502 is a wasteful number, since it uses less digits than its factorization.

261043502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30162.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 261043502 is about 16156.8407184078. The cubic root of 261043502 is about 639.1031562583.

Adding to 261043502 its reverse (205340162), we get a palindrome (466383664).

The spelling of 261043502 in words is "two hundred sixty-one million, forty-three thousand, five hundred two".