2156379749 has 8 divisors (see below), whose sum is σ = 2271060000. Its totient is φ = 2041818192.

The previous prime is 2156379737. The next prime is 2156379763. The reversal of 2156379749 is 9479736512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2156379749 - 2⁴ = 2156379733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156379749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156379769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8927 + ... + 66275.

It is an arithmetic number, because the mean of its divisors is an integer number (283882500).

Almost surely, 2^2156379749 is an apocalyptic number.

It is an amenable number.

2156379749 is a deficient number, since it is larger than the sum of its proper divisors (114680251).

2156379749 is a wasteful number, since it uses less digits than its factorization.

2156379749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59347.

The product of its digits is 2857680, while the sum is 53.

The square root of 2156379749 is about 46436.8361217687. The cubic root of 2156379749 is about 1291.9382255112.

The spelling of 2156379749 in words is "two billion, one hundred fifty-six million, three hundred seventy-nine thousand, seven hundred forty-nine".