2157651473 has 2 divisors, whose sum is σ = 2157651474. Its totient is φ = 2157651472.

The previous prime is 2157651439. The next prime is 2157651479. The reversal of 2157651473 is 3741567512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1531000384 + 626651089 = 39128^2 + 25033^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157651473 - 2¹⁸ = 2157389329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2157651473.

It is not a weakly prime, because it can be changed into another prime (2157651479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078825736 + 1078825737.

It is an arithmetic number, because the mean of its divisors is an integer number (1078825737).

Almost surely, 2^2157651473 is an apocalyptic number.

It is an amenable number.

2157651473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157651473 is an equidigital number, since it uses as much as digits as its factorization.

2157651473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 41.

The square root of 2157651473 is about 46450.5271552434. The cubic root of 2157651473 is about 1292.1921489324.

The spelling of 2157651473 in words is "two billion, one hundred fifty-seven million, six hundred fifty-one thousand, four hundred seventy-three".