155781097 has 8 divisors (see below), whose sum is σ = 158316512. Its totient is φ = 153252000.

The previous prime is 155781083. The next prime is 155781161. The reversal of 155781097 is 790187551.

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-155781097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155781697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85597 + ... + 87397.

It is an arithmetic number, because the mean of its divisors is an integer number (19789564).

Almost surely, 2^155781097 is an apocalyptic number.

It is an amenable number.

155781097 is a deficient number, since it is larger than the sum of its proper divisors (2535415).

155781097 is a wasteful number, since it uses less digits than its factorization.

155781097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159.

The product of its (nonzero) digits is 88200, while the sum is 43.

The square root of 155781097 is about 12481.2297871644. The cubic root of 155781097 is about 538.0693481729.

The spelling of 155781097 in words is "one hundred fifty-five million, seven hundred eighty-one thousand, ninety-seven".