155649 has 12 divisors (see below), whose sum is σ = 225456. Its totient is φ = 95472.

The previous prime is 155627. The next prime is 155653. The reversal of 155649 is 946551.

It is not a de Polignac number, because 155649 - 2⁷ = 155521 is a prime.

It is a super-2 number, since 2×155649² = 48453222402, which contains 22 as substring.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155649.

It is not an unprimeable number, because it can be changed into a prime (155609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 354 + ... + 660.

It is an arithmetic number, because the mean of its divisors is an integer number (18788).

It is a Proth number, since it is equal to 19 ⋅ 2¹³ + 1 and 19 < 2¹³.

2¹⁵⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

155649 is a deficient number, since it is larger than the sum of its proper divisors (69807).

155649 is a wasteful number, since it uses less digits than its factorization.

155649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 323 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 155649 is about 394.5237635428. The cubic root of 155649 is about 53.7917217078.

The spelling of 155649 in words is "one hundred fifty-five thousand, six hundred forty-nine".