1491118225 has 9 divisors (see below), whose sum is σ = 1849226043. Its totient is φ = 1192740120.

The previous prime is 1491118219. The next prime is 1491118249. The reversal of 1491118225 is 5228111941.

The square root of 1491118225 is 38615.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 536802561 + 954315664 = 23169^2 + 30892^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1491118225 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 189214 + ... + 196936.

Almost surely, 2^1491118225 is an apocalyptic number.

1491118225 is the 38615-th square number.

1491118225 is the 19308-th centered octagonal number.

It is an amenable number.

1491118225 is a deficient number, since it is larger than the sum of its proper divisors (358107818).

1491118225 is an frugal number, since it uses more digits than its factorization.

1491118225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15456 (or 7728 counting only the distinct ones).

The product of its digits is 5760, while the sum is 34.

The cubic root of 1491118225 is about 1142.4504141775.

It can be divided in two parts, 1491 and 118225, that added together give a square (119716 = 346²).

The spelling of 1491118225 in words is "one billion, four hundred ninety-one million, one hundred eighteen thousand, two hundred twenty-five".