1272173155 has 16 divisors (see below), whose sum is σ = 1763355744. Its totient is φ = 870791680.

The previous prime is 1272173143. The next prime is 1272173167. The reversal of 1272173155 is 5513712721.

It is an interprime number because it is at equal distance from previous prime (1272173143) and next prime (1272173167).

It is not a de Polignac number, because 1272173155 - 2¹³ = 1272164963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272173155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 679372 + ... + 681241.

It is an arithmetic number, because the mean of its divisors is an integer number (110209734).

Almost surely, 2^1272173155 is an apocalyptic number.

1272173155 is a deficient number, since it is larger than the sum of its proper divisors (491182589).

1272173155 is a wasteful number, since it uses less digits than its factorization.

1272173155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360646.

The product of its digits is 14700, while the sum is 34.

The square root of 1272173155 is about 35667.5364302050. The cubic root of 1272173155 is about 1083.5494657267.

Adding to 1272173155 its reverse (5513712721), we get a palindrome (6785885876).

The spelling of 1272173155 in words is "one billion, two hundred seventy-two million, one hundred seventy-three thousand, one hundred fifty-five".