2155161461 has 2 divisors, whose sum is σ = 2155161462. Its totient is φ = 2155161460.

The previous prime is 2155161457. The next prime is 2155161467. The reversal of 2155161461 is 1641615512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2152032100 + 3129361 = 46390^2 + 1769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155161461 - 2² = 2155161457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155161467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077580730 + 1077580731.

It is an arithmetic number, because the mean of its divisors is an integer number (1077580731).

Almost surely, 2^2155161461 is an apocalyptic number.

It is an amenable number.

2155161461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155161461 is an equidigital number, since it uses as much as digits as its factorization.

2155161461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 32.

The square root of 2155161461 is about 46423.7165789212. The cubic root of 2155161461 is about 1291.6948779372.

Adding to 2155161461 its reverse (1641615512), we get a palindrome (3796776973).

The spelling of 2155161461 in words is "two billion, one hundred fifty-five million, one hundred sixty-one thousand, four hundred sixty-one".