1057615397 has 4 divisors (see below), whose sum is σ = 1057930860. Its totient is φ = 1057299936.

The previous prime is 1057615393. The next prime is 1057615409. The reversal of 1057615397 is 7935167501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 557243236 + 500372161 = 23606^2 + 22369^2 .

It is a cyclic number.

It is not a de Polignac number, because 1057615397 - 2² = 1057615393 is a prime.

It is a super-2 number, since 2×1057615397² = 2237100655942935218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057615393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152648 + ... + 159425.

It is an arithmetic number, because the mean of its divisors is an integer number (264482715).

Almost surely, 2^1057615397 is an apocalyptic number.

It is an amenable number.

1057615397 is a deficient number, since it is larger than the sum of its proper divisors (315463).

1057615397 is an equidigital number, since it uses as much as digits as its factorization.

1057615397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315462.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 1057615397 is about 32520.9993235140. Note that the first 3 decimals coincide. The cubic root of 1057615397 is about 1018.8476660378.

Adding to 1057615397 its sum of digits (44), we get a square (1057615441 = 32521²).

The spelling of 1057615397 in words is "one billion, fifty-seven million, six hundred fifteen thousand, three hundred ninety-seven".