1491427161 has 45 divisors (see below), whose sum is σ = 2595913551. Its totient is φ = 850853808.

The previous prime is 1491427123. The next prime is 1491427213. The reversal of 1491427161 is 1617241941.

The square root of 1491427161 is 38619.

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

1491427161 is a `hidden beast` number, since 1 + 491 + 4 + 2 + 7 + 161 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4862025 + 1486565136 = 2205^2 + 38556^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1491427161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491427361) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2432691 + ... + 2433303.

Almost surely, 2^1491427161 is an apocalyptic number.

1491427161 is the 38619-th square number.

1491427161 is the 19310-th centered octagonal number.

It is an amenable number.

1491427161 is a deficient number, since it is larger than the sum of its proper divisors (1104486390).

1491427161 is an frugal number, since it uses more digits than its factorization.

1491427161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 623 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The cubic root of 1491427161 is about 1142.5293079194.

Multiplying 1491427161 by its sum of digits (36), we get a square (53691377796 = 231714²).

The spelling of 1491427161 in words is "one billion, four hundred ninety-one million, four hundred twenty-seven thousand, one hundred sixty-one".