261012135 has 16 divisors (see below), whose sum is σ = 442185696. Its totient is φ = 131017728.

The previous prime is 261012133. The next prime is 261012137. The reversal of 261012135 is 531210162.

It is an interprime number because it is at equal distance from previous prime (261012133) and next prime (261012137).

It is not a de Polignac number, because 261012135 - 2¹ = 261012133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261012131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 511534 + ... + 512043.

It is an arithmetic number, because the mean of its divisors is an integer number (27636606).

Almost surely, 2^261012135 is an apocalyptic number.

261012135 is a deficient number, since it is larger than the sum of its proper divisors (181173561).

261012135 is a wasteful number, since it uses less digits than its factorization.

261012135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023602.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 261012135 is about 16155.8699858596. The cubic root of 261012135 is about 639.0775570108.

Adding to 261012135 its reverse (531210162), we get a palindrome (792222297).

The spelling of 261012135 in words is "two hundred sixty-one million, twelve thousand, one hundred thirty-five".