1491745 has 4 divisors (see below), whose sum is σ = 1790100. Its totient is φ = 1193392.

The previous prime is 1491739. The next prime is 1491761. The reversal of 1491745 is 5471941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5471941 = 83 ⋅65927.

It can be written as a sum of positive squares in 2 ways, for example, as 719104 + 772641 = 848^2 + 879^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491745 - 2⁹ = 1491233 is a prime.

1491745 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149170 + ... + 149179.

It is an arithmetic number, because the mean of its divisors is an integer number (447525).

2^1491745 is an apocalyptic number.

It is an amenable number.

1491745 is a deficient number, since it is larger than the sum of its proper divisors (298355).

1491745 is an equidigital number, since it uses as much as digits as its factorization.

1491745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298354.

The product of its digits is 5040, while the sum is 31.

The square root of 1491745 is about 1221.3701322695. The cubic root of 1491745 is about 114.2610463873.

It can be divided in two parts, 1491 and 745, that multiplied together give a triangular number (1110795 = T₁₄₉₀).

The spelling of 1491745 in words is "one million, four hundred ninety-one thousand, seven hundred forty-five".