135900261 has 80 divisors (see below), whose sum is σ = 256760064. Its totient is φ = 69797376.

The previous prime is 135900257. The next prime is 135900283. The reversal of 135900261 is 162009531.

135900261 is a `hidden beast` number, since 13 + 590 + 0 + 2 + 61 = 666.

It is not a de Polignac number, because 135900261 - 2² = 135900257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135900211) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 221391 + ... + 222003.

Almost surely, 2^135900261 is an apocalyptic number.

It is an amenable number.

135900261 is a deficient number, since it is larger than the sum of its proper divisors (120859803).

135900261 is a wasteful number, since it uses less digits than its factorization.

135900261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 135900261 is about 11657.6267310289. The cubic root of 135900261 is about 514.1305731448.

Adding to 135900261 its reverse (162009531), we get a palindrome (297909792).

It can be divided in two parts, 135900 and 261, that added together give a square (136161 = 369²).

The spelling of 135900261 in words is "one hundred thirty-five million, nine hundred thousand, two hundred sixty-one".