2156403316 has 6 divisors (see below), whose sum is σ = 3773705810. Its totient is φ = 1078201656.

The previous prime is 2156403311. The next prime is 2156403317. The reversal of 2156403316 is 6133046512.

It can be written as a sum of positive squares in only one way, i.e., 1971715216 + 184688100 = 44404^2 + 13590^2 .

It is a super-2 number, since 2×2156403316² = 9300150522511591712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156403311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269550411 + ... + 269550418.

Almost surely, 2^2156403316 is an apocalyptic number.

It is an amenable number.

2156403316 is a deficient number, since it is larger than the sum of its proper divisors (1617302494).

2156403316 is a wasteful number, since it uses less digits than its factorization.

2156403316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539100833 (or 539100831 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 2156403316 is about 46437.0898743666. The cubic root of 2156403316 is about 1291.9429320102.

Adding to 2156403316 its reverse (6133046512), we get a palindrome (8289449828).

The spelling of 2156403316 in words is "two billion, one hundred fifty-six million, four hundred three thousand, three hundred sixteen".