155681377 has 4 divisors (see below), whose sum is σ = 155728816. Its totient is φ = 155633940.

The previous prime is 155681369. The next prime is 155681389. The reversal of 155681377 is 773186551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155681377 - 2³ = 155681369 is a prime.

It is a super-2 number, since 2×155681377² = 48473382289232258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155681347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18399 + ... + 25492.

It is an arithmetic number, because the mean of its divisors is an integer number (38932204).

Almost surely, 2^155681377 is an apocalyptic number.

It is an amenable number.

155681377 is a deficient number, since it is larger than the sum of its proper divisors (47439).

155681377 is an equidigital number, since it uses as much as digits as its factorization.

155681377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47438.

The product of its digits is 176400, while the sum is 43.

The square root of 155681377 is about 12477.2343490054. The cubic root of 155681377 is about 537.9545123991.

The spelling of 155681377 in words is "one hundred fifty-five million, six hundred eighty-one thousand, three hundred seventy-seven".