156649 has 4 divisors (see below), whose sum is σ = 160336. Its totient is φ = 152964.

The previous prime is 156641. The next prime is 156659. The reversal of 156649 is 946651.

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, and also an emirpimes, since its reverse is a distinct semiprime: 946651 = 929 ⋅1019.

It is a cyclic number.

It is not a de Polignac number, because 156649 - 2³ = 156641 is a prime.

It is a Duffinian number.

156649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 156649.

It is not an unprimeable number, because it can be changed into a prime (156641) 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, 1779 + ... + 1864.

It is an arithmetic number, because the mean of its divisors is an integer number (40084).

2¹⁵⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

156649 is a deficient number, since it is larger than the sum of its proper divisors (3687).

156649 is an equidigital number, since it uses as much as digits as its factorization.

156649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686.

The product of its digits is 6480, while the sum is 31.

The square root of 156649 is about 395.7890852462. The cubic root of 156649 is about 53.9066746518.

The spelling of 156649 in words is "one hundred fifty-six thousand, six hundred forty-nine".