1491157 has 2 divisors, whose sum is σ = 1491158. Its totient is φ = 1491156.

The previous prime is 1491109. The next prime is 1491179. The reversal of 1491157 is 7511941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 904401 + 586756 = 951^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491157 - 2¹¹ = 1489109 is a prime.

1491157 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1495157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745578 + 745579.

It is an arithmetic number, because the mean of its divisors is an integer number (745579).

2^1491157 is an apocalyptic number.

It is an amenable number.

1491157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491157 is an equidigital number, since it uses as much as digits as its factorization.

1491157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 28.

The square root of 1491157 is about 1221.1293952731. The cubic root of 1491157 is about 114.2460316842.

The spelling of 1491157 in words is "one million, four hundred ninety-one thousand, one hundred fifty-seven".