156493861 has 6 divisors (see below), whose sum is σ = 165164262. Its totient is φ = 148257000.

The previous prime is 156493849. The next prime is 156493871. The reversal of 156493861 is 168394651.

It can be written as a sum of positive squares in only one way, i.e., 145564225 + 10929636 = 12065^2 + 3306^2 .

It is not a de Polignac number, because 156493861 - 2⁹ = 156493349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156493811) 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 5 ways as a sum of consecutive naturals, for example, 216390 + ... + 217111.

It is an arithmetic number, because the mean of its divisors is an integer number (27527377).

Almost surely, 2^156493861 is an apocalyptic number.

It is an amenable number.

156493861 is a deficient number, since it is larger than the sum of its proper divisors (8670401).

156493861 is an equidigital number, since it uses as much as digits as its factorization.

156493861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433539 (or 433520 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 156493861 is about 12509.7506370031. The cubic root of 156493861 is about 538.8887309140. Note that the first 3 decimals are identical.

The spelling of 156493861 in words is "one hundred fifty-six million, four hundred ninety-three thousand, eight hundred sixty-one".