135961537 has 4 divisors (see below), whose sum is σ = 136069120. Its totient is φ = 135853956.

The previous prime is 135961523. The next prime is 135961577. The reversal of 135961537 is 735169531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135961537 - 2⁷ = 135961409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135961537.

It is not an unprimeable number, because it can be changed into a prime (135961577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51873 + ... + 54430.

It is an arithmetic number, because the mean of its divisors is an integer number (34017280).

Almost surely, 2^135961537 is an apocalyptic number.

It is an amenable number.

135961537 is a deficient number, since it is larger than the sum of its proper divisors (107583).

135961537 is a wasteful number, since it uses less digits than its factorization.

135961537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107582.

The product of its digits is 85050, while the sum is 40.

The square root of 135961537 is about 11660.2545855569. The cubic root of 135961537 is about 514.2078335587.

The spelling of 135961537 in words is "one hundred thirty-five million, nine hundred sixty-one thousand, five hundred thirty-seven".