156078649 has 4 divisors (see below), whose sum is σ = 165259764. Its totient is φ = 146897536.

The previous prime is 156078647. The next prime is 156078679. The reversal of 156078649 is 946870651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946870651 = 463 ⋅2045077.

It can be written as a sum of positive squares in 2 ways, for example, as 120890025 + 35188624 = 10995^2 + 5932^2 .

It is a cyclic number.

It is not a de Polignac number, because 156078649 - 2¹ = 156078647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156078599 and 156078608.

It is not an unprimeable number, because it can be changed into a prime (156078647) 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 3 ways as a sum of consecutive naturals, for example, 4590532 + ... + 4590565.

It is an arithmetic number, because the mean of its divisors is an integer number (41314941).

Almost surely, 2^156078649 is an apocalyptic number.

It is an amenable number.

156078649 is a deficient number, since it is larger than the sum of its proper divisors (9181115).

156078649 is an equidigital number, since it uses as much as digits as its factorization.

156078649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181114.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 156078649 is about 12493.1440798544. The cubic root of 156078649 is about 538.4117127381.

The spelling of 156078649 in words is "one hundred fifty-six million, seventy-eight thousand, six hundred forty-nine".