1491551941 has 8 divisors (see below), whose sum is σ = 1643259168. Its totient is φ = 1342530000.

The previous prime is 1491551939. The next prime is 1491551947.

1491551941 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1491551941 - 2¹ = 1491551939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1491551894 and 1491551903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491551947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670155 + ... + 672376.

It is an arithmetic number, because the mean of its divisors is an integer number (205407396).

Almost surely, 2^1491551941 is an apocalyptic number.

1491551941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1491551941 is a deficient number, since it is larger than the sum of its proper divisors (151707227).

1491551941 is a wasteful number, since it uses less digits than its factorization.

1491551941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342643.

The product of its digits is 32400, while the sum is 40.

The square root of 1491551941 is about 38620.6154922471. The cubic root of 1491551941 is about 1142.5611702043.

The spelling of 1491551941 in words is "one billion, four hundred ninety-one million, five hundred fifty-one thousand, nine hundred forty-one".