1521354257 has 2 divisors, whose sum is σ = 1521354258. Its totient is φ = 1521354256.

The previous prime is 1521354253. The next prime is 1521354269. The reversal of 1521354257 is 7524531251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1274204416 + 247149841 = 35696^2 + 15721^2 .

It is an emirp because it is prime and its reverse (7524531251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1521354257 - 2² = 1521354253 is a prime.

It is not a weakly prime, because it can be changed into another prime (1521354253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760677128 + 760677129.

It is an arithmetic number, because the mean of its divisors is an integer number (760677129).

Almost surely, 2^1521354257 is an apocalyptic number.

It is an amenable number.

1521354257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521354257 is an equidigital number, since it uses as much as digits as its factorization.

1521354257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42000, while the sum is 35.

The square root of 1521354257 is about 39004.5414919853. The cubic root of 1521354257 is about 1150.1207830291.

The spelling of 1521354257 in words is "one billion, five hundred twenty-one million, three hundred fifty-four thousand, two hundred fifty-seven".