1491653 has 2 divisors, whose sum is σ = 1491654. Its totient is φ = 1491652.

The previous prime is 1491649. The next prime is 1491661. The reversal of 1491653 is 3561941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1304164 + 187489 = 1142^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491653 - 2² = 1491649 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745826 + 745827.

It is an arithmetic number, because the mean of its divisors is an integer number (745827).

2^1491653 is an apocalyptic number.

It is an amenable number.

1491653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491653 is an equidigital number, since it uses as much as digits as its factorization.

1491653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1491653 is about 1221.3324690681. The cubic root of 1491653 is about 114.2586974084.

The spelling of 1491653 in words is "one million, four hundred ninety-one thousand, six hundred fifty-three".