1491621 has 16 divisors (see below), whose sum is σ = 2079168. Its totient is φ = 950400.

The previous prime is 1491601. The next prime is 1491629. The reversal of 1491621 is 1261941.

It is not a de Polignac number, because 1491621 - 2⁷ = 1491493 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1491591 and 1491600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8151 + ... + 8331.

It is an arithmetic number, because the mean of its divisors is an integer number (129948).

2^1491621 is an apocalyptic number.

It is an amenable number.

1491621 is a deficient number, since it is larger than the sum of its proper divisors (587547).

1491621 is a wasteful number, since it uses less digits than its factorization.

1491621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its digits is 432, while the sum is 24.

The square root of 1491621 is about 1221.3193685519. The cubic root of 1491621 is about 114.2578803497.

It can be divided in two parts, 14916 and 21, that multiplied together give a triangular number (313236 = T₇₉₁).

The spelling of 1491621 in words is "one million, four hundred ninety-one thousand, six hundred twenty-one".