1372228181 has 4 divisors (see below), whose sum is σ = 1379124000. Its totient is φ = 1365332364.

The previous prime is 1372228163. The next prime is 1372228189. The reversal of 1372228181 is 1818222731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1372228181 - 2²⁶ = 1305119317 is a prime.

It is a super-2 number, since 2×1372228181² = 3766020361461137522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1372228189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3447611 + ... + 3448008.

It is an arithmetic number, because the mean of its divisors is an integer number (344781000).

Almost surely, 2^1372228181 is an apocalyptic number.

It is an amenable number.

1372228181 is a deficient number, since it is larger than the sum of its proper divisors (6895819).

1372228181 is an equidigital number, since it uses as much as digits as its factorization.

1372228181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895818.

The product of its digits is 10752, while the sum is 35.

The square root of 1372228181 is about 37043.5983808269. The cubic root of 1372228181 is about 1111.2423341126.

The spelling of 1372228181 in words is "one billion, three hundred seventy-two million, two hundred twenty-eight thousand, one hundred eighty-one".