261102015 has 32 divisors (see below), whose sum is σ = 471125760. Its totient is φ = 137171232.

The previous prime is 261102011. The next prime is 261102019. The reversal of 261102015 is 510201162.

It is an interprime number because it is at equal distance from previous prime (261102011) and next prime (261102019).

It is not a de Polignac number, because 261102015 - 2² = 261102011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261102011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5389 + ... + 23478.

It is an arithmetic number, because the mean of its divisors is an integer number (14722680).

Almost surely, 2^261102015 is an apocalyptic number.

261102015 is a deficient number, since it is larger than the sum of its proper divisors (210023745).

261102015 is a wasteful number, since it uses less digits than its factorization.

261102015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28948 (or 28942 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 261102015 is about 16158.6513979354. The cubic root of 261102015 is about 639.1509044292.

Adding to 261102015 its reverse (510201162), we get a palindrome (771303177).

The spelling of 261102015 in words is "two hundred sixty-one million, one hundred two thousand, fifteen".