1071957561 has 16 divisors (see below), whose sum is σ = 1506120000. Its totient is φ = 676297728.

The previous prime is 1071957553. The next prime is 1071957569. The reversal of 1071957561 is 1657591701.

It is an interprime number because it is at equal distance from previous prime (1071957553) and next prime (1071957569).

It is not a de Polignac number, because 1071957561 - 2³ = 1071957553 is a prime.

It is a super-2 number, since 2×1071957561² = 2298186025170137442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1071957569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46065 + ... + 65313.

It is an arithmetic number, because the mean of its divisors is an integer number (94132500).

Almost surely, 2^1071957561 is an apocalyptic number.

It is an amenable number.

1071957561 is a deficient number, since it is larger than the sum of its proper divisors (434162439).

1071957561 is a wasteful number, since it uses less digits than its factorization.

1071957561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20248.

The product of its (nonzero) digits is 66150, while the sum is 42.

The square root of 1071957561 is about 32740.7629874443. The cubic root of 1071957561 is about 1023.4324835996.

The spelling of 1071957561 in words is "one billion, seventy-one million, nine hundred fifty-seven thousand, five hundred sixty-one".