1143257961 has 8 divisors (see below), whose sum is σ = 1524520480. Its totient is φ = 762083712.

The previous prime is 1143257957. The next prime is 1143257963. The reversal of 1143257961 is 1697523411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1143257961 - 2² = 1143257957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1143257963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19161 + ... + 51513.

It is an arithmetic number, because the mean of its divisors is an integer number (190565060).

Almost surely, 2^1143257961 is an apocalyptic number.

It is an amenable number.

1143257961 is a deficient number, since it is larger than the sum of its proper divisors (381262519).

1143257961 is a wasteful number, since it uses less digits than its factorization.

1143257961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44135.

The product of its digits is 45360, while the sum is 39.

The square root of 1143257961 is about 33812.0978497342. The cubic root of 1143257961 is about 1045.6381292065.

The spelling of 1143257961 in words is "one billion, one hundred forty-three million, two hundred fifty-seven thousand, nine hundred sixty-one".