1531357 has 2 divisors, whose sum is σ = 1531358. Its totient is φ = 1531356.

The previous prime is 1531337. The next prime is 1531367. The reversal of 1531357 is 7531351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 649636 = 939^2 + 806^2 .

It is an emirp because it is prime and its reverse (7531351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1531357 - 2¹¹ = 1529309 is a prime.

It is a super-2 number, since 2×1531357² = 4690108522898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765678 + 765679.

It is an arithmetic number, because the mean of its divisors is an integer number (765679).

2^1531357 is an apocalyptic number.

It is an amenable number.

1531357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531357 is an equidigital number, since it uses as much as digits as its factorization.

1531357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1575, while the sum is 25.

The square root of 1531357 is about 1237.4801008501. The cubic root of 1531357 is about 115.2635919556.

The spelling of 1531357 in words is "one million, five hundred thirty-one thousand, three hundred fifty-seven".