1656154949 has 4 divisors (see below), whose sum is σ = 1656299436. Its totient is φ = 1656010464.

The previous prime is 1656154937. The next prime is 1656154967. The reversal of 1656154949 is 9494516561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1403026849 + 253128100 = 37457^2 + 15910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656154949 - 2²⁸ = 1387719493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1656154897 and 1656154906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656153949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53414 + ... + 78519.

It is an arithmetic number, because the mean of its divisors is an integer number (414074859).

Almost surely, 2^1656154949 is an apocalyptic number.

It is an amenable number.

1656154949 is a deficient number, since it is larger than the sum of its proper divisors (144487).

1656154949 is a wasteful number, since it uses less digits than its factorization.

1656154949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144486.

The product of its digits is 1166400, while the sum is 50.

The square root of 1656154949 is about 40695.8836861912. The cubic root of 1656154949 is about 1183.1332388688.

The spelling of 1656154949 in words is "one billion, six hundred fifty-six million, one hundred fifty-four thousand, nine hundred forty-nine".