1143761657 has 4 divisors (see below), whose sum is σ = 1144361460. Its totient is φ = 1143161856.

The previous prime is 1143761609. The next prime is 1143761681. The reversal of 1143761657 is 7561673411.

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 728784016 + 414977641 = 26996^2 + 20371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143761657 - 2¹⁰ = 1143760633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1143761357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297032 + ... + 300857.

It is an arithmetic number, because the mean of its divisors is an integer number (286090365).

Almost surely, 2^1143761657 is an apocalyptic number.

It is an amenable number.

1143761657 is a deficient number, since it is larger than the sum of its proper divisors (599803).

1143761657 is an equidigital number, since it uses as much as digits as its factorization.

1143761657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599802.

The product of its digits is 105840, while the sum is 41.

The square root of 1143761657 is about 33819.5454877797. The cubic root of 1143761657 is about 1045.7916688950.

The spelling of 1143761657 in words is "one billion, one hundred forty-three million, seven hundred sixty-one thousand, six hundred fifty-seven".