134161781 has 8 divisors (see below), whose sum is σ = 146223840. Its totient is φ = 122348592.

The previous prime is 134161757. The next prime is 134161787. The reversal of 134161781 is 187161431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134161781 is a prime.

It is a super-2 number, since 2×134161781² = 35998766962183922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134161787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61091 + ... + 63248.

It is an arithmetic number, because the mean of its divisors is an integer number (18277980).

Almost surely, 2^134161781 is an apocalyptic number.

It is an amenable number.

134161781 is a deficient number, since it is larger than the sum of its proper divisors (12062059).

134161781 is a wasteful number, since it uses less digits than its factorization.

134161781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124435.

The product of its digits is 4032, while the sum is 32.

The square root of 134161781 is about 11582.8226697986. The cubic root of 134161781 is about 511.9288498238.

The spelling of 134161781 in words is "one hundred thirty-four million, one hundred sixty-one thousand, seven hundred eighty-one".