155681797 has 4 divisors (see below), whose sum is σ = 159478956. Its totient is φ = 151884640.

The previous prime is 155681777. The next prime is 155681833. The reversal of 155681797 is 797186551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86974276 + 68707521 = 9326^2 + 8289^2 .

It is a cyclic number.

It is not a de Polignac number, because 155681797 - 2¹⁵ = 155649029 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 155681797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155681717) 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, 1898518 + ... + 1898599.

It is an arithmetic number, because the mean of its divisors is an integer number (39869739).

Almost surely, 2^155681797 is an apocalyptic number.

It is an amenable number.

155681797 is a deficient number, since it is larger than the sum of its proper divisors (3797159).

155681797 is an equidigital number, since it uses as much as digits as its factorization.

155681797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797158.

The product of its digits is 529200, while the sum is 49.

The square root of 155681797 is about 12477.2511796469. The cubic root of 155681797 is about 537.9549961664.

The spelling of 155681797 in words is "one hundred fifty-five million, six hundred eighty-one thousand, seven hundred ninety-seven".