1491411197 has 4 divisors (see below), whose sum is σ = 1491560316. Its totient is φ = 1491262080.

The previous prime is 1491411193. The next prime is 1491411239. The reversal of 1491411197 is 7911141941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7911141941 = 17207 ⋅459763.

It can be written as a sum of positive squares in 2 ways, for example, as 327646201 + 1163764996 = 18101^2 + 34114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491411197 - 2² = 1491411193 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 1491411197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491411193) 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, 58388 + ... + 79949.

It is an arithmetic number, because the mean of its divisors is an integer number (372890079).

Almost surely, 2^1491411197 is an apocalyptic number.

It is an amenable number.

1491411197 is a deficient number, since it is larger than the sum of its proper divisors (149119).

1491411197 is a wasteful number, since it uses less digits than its factorization.

1491411197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149118.

The product of its digits is 9072, while the sum is 38.

The square root of 1491411197 is about 38618.7933136187. The cubic root of 1491411197 is about 1142.5252314206.

The spelling of 1491411197 in words is "one billion, four hundred ninety-one million, four hundred eleven thousand, one hundred ninety-seven".