1071731657 has 2 divisors, whose sum is σ = 1071731658. Its totient is φ = 1071731656.

The previous prime is 1071731611. The next prime is 1071731693. The reversal of 1071731657 is 7561371701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 868127296 + 203604361 = 29464^2 + 14269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071731657 - 2¹⁰ = 1071730633 is a prime.

It is a super-2 number, since 2×1071731657² = 2297217489231931298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1071731657.

It is not a weakly prime, because it can be changed into another prime (1071731057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535865828 + 535865829.

It is an arithmetic number, because the mean of its divisors is an integer number (535865829).

Almost surely, 2^1071731657 is an apocalyptic number.

It is an amenable number.

1071731657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071731657 is an equidigital number, since it uses as much as digits as its factorization.

1071731657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 1071731657 is about 32737.3129166094. The cubic root of 1071731657 is about 1023.3605859353.

The spelling of 1071731657 in words is "one billion, seventy-one million, seven hundred thirty-one thousand, six hundred fifty-seven".