2156051407 has 4 divisors (see below), whose sum is σ = 2156696640. Its totient is φ = 2155406176.

The previous prime is 2156051393. The next prime is 2156051437. The reversal of 2156051407 is 7041506512.

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

It is a cyclic number.

It is not a de Polignac number, because 2156051407 - 2⁷ = 2156051279 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 (2156051437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317578 + ... + 324295.

It is an arithmetic number, because the mean of its divisors is an integer number (539174160).

Almost surely, 2^2156051407 is an apocalyptic number.

2156051407 is a deficient number, since it is larger than the sum of its proper divisors (645233).

2156051407 is an equidigital number, since it uses as much as digits as its factorization.

2156051407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645232.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 2156051407 is about 46433.3006257363. The cubic root of 2156051407 is about 1291.8726496909.

Adding to 2156051407 its reverse (7041506512), we get a palindrome (9197557919).

The spelling of 2156051407 in words is "two billion, one hundred fifty-six million, fifty-one thousand, four hundred seven".