135101781 has 6 divisors (see below), whose sum is σ = 195147030. Its totient is φ = 90067848.

The previous prime is 135101779. The next prime is 135101789. The reversal of 135101781 is 187101531.

135101781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 112148100 + 22953681 = 10590^2 + 4791^2 .

It is not a de Polignac number, because 135101781 - 2¹ = 135101779 is a prime.

It is a super-2 number, since 2×135101781² = 36504982458743922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135101789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7505646 + ... + 7505663.

It is an arithmetic number, because the mean of its divisors is an integer number (32524505).

Almost surely, 2^135101781 is an apocalyptic number.

It is an amenable number.

135101781 is a deficient number, since it is larger than the sum of its proper divisors (60045249).

135101781 is a wasteful number, since it uses less digits than its factorization.

135101781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15011315 (or 15011312 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 27.

The square root of 135101781 is about 11623.3291702507. The cubic root of 135101781 is about 513.1216724039.

The spelling of 135101781 in words is "one hundred thirty-five million, one hundred one thousand, seven hundred eighty-one".