2156071454 has 4 divisors (see below), whose sum is σ = 3234107184. Its totient is φ = 1078035726.

The previous prime is 2156071453. The next prime is 2156071481. The reversal of 2156071454 is 4541706512.

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

It is a super-2 number, since 2×2156071454² = 9297288229507348232, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156071453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539017862 + ... + 539017865.

It is an arithmetic number, because the mean of its divisors is an integer number (808526796).

Almost surely, 2^2156071454 is an apocalyptic number.

2156071454 is a deficient number, since it is larger than the sum of its proper divisors (1078035730).

2156071454 is a wasteful number, since it uses less digits than its factorization.

2156071454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078035729.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 2156071454 is about 46433.5164940154. The cubic root of 2156071454 is about 1291.8766536292.

Adding to 2156071454 its reverse (4541706512), we get a palindrome (6697777966).

The spelling of 2156071454 in words is "two billion, one hundred fifty-six million, seventy-one thousand, four hundred fifty-four".