135981570 has 32 divisors (see below), whose sum is σ = 332517312. Its totient is φ = 35577152.

The previous prime is 135981557. The next prime is 135981583. The reversal of 135981570 is 75189531.

It is an interprime number because it is at equal distance from previous prime (135981557) and next prime (135981583).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41172 + ... + 44351.

It is an arithmetic number, because the mean of its divisors is an integer number (10391166).

Almost surely, 2^135981570 is an apocalyptic number.

135981570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

135981570 is an abundant number, since it is smaller than the sum of its proper divisors (196535742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135981570 is a wasteful number, since it uses less digits than its factorization.

135981570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85586.

The product of its (nonzero) digits is 37800, while the sum is 39.

The square root of 135981570 is about 11661.1135831875. The cubic root of 135981570 is about 514.2330873177.

The spelling of 135981570 in words is "one hundred thirty-five million, nine hundred eighty-one thousand, five hundred seventy".