1157442047 has 4 divisors (see below), whose sum is σ = 1157518056. Its totient is φ = 1157366040.

The previous prime is 1157442043. The next prime is 1157442053. The reversal of 1157442047 is 7402447511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7402447511 = 167 ⋅44326033.

It is a cyclic number.

It is not a de Polignac number, because 1157442047 - 2² = 1157442043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1157441998 and 1157442016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157442043) 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, 6404 + ... + 48537.

It is an arithmetic number, because the mean of its divisors is an integer number (289379514).

Almost surely, 2^1157442047 is an apocalyptic number.

1157442047 is a deficient number, since it is larger than the sum of its proper divisors (76009).

1157442047 is an equidigital number, since it uses as much as digits as its factorization.

1157442047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76008.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 1157442047 is about 34021.1999641400. The cubic root of 1157442047 is about 1049.9446824977.

Adding to 1157442047 its reverse (7402447511), we get a palindrome (8559889558).

The spelling of 1157442047 in words is "one billion, one hundred fifty-seven million, four hundred forty-two thousand, forty-seven".