2151531227 has 2 divisors, whose sum is σ = 2151531228. Its totient is φ = 2151531226.

The previous prime is 2151531209. The next prime is 2151531289. The reversal of 2151531227 is 7221351512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151531227 - 2⁶ = 2151531163 is a prime.

It is a super-2 number, since 2×2151531227² = 9258173241512251058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2151531227.

It is not a weakly prime, because it can be changed into another prime (2151534227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075765613 + 1075765614.

It is an arithmetic number, because the mean of its divisors is an integer number (1075765614).

Almost surely, 2^2151531227 is an apocalyptic number.

2151531227 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151531227 is an equidigital number, since it uses as much as digits as its factorization.

2151531227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 2151531227 is about 46384.6011840136. The cubic root of 2151531227 is about 1290.9692107305.

Adding to 2151531227 its reverse (7221351512), we get a palindrome (9372882739).

The spelling of 2151531227 in words is "two billion, one hundred fifty-one million, five hundred thirty-one thousand, two hundred twenty-seven".