1142421557 has 2 divisors, whose sum is σ = 1142421558. Its totient is φ = 1142421556.

The previous prime is 1142421551. The next prime is 1142421587. The reversal of 1142421557 is 7551242411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 984014161 + 158407396 = 31369^2 + 12586^2 .

It is an emirp because it is prime and its reverse (7551242411) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142421557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142421551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571210778 + 571210779.

It is an arithmetic number, because the mean of its divisors is an integer number (571210779).

Almost surely, 2^1142421557 is an apocalyptic number.

It is an amenable number.

1142421557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142421557 is an equidigital number, since it uses as much as digits as its factorization.

1142421557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 32.

The square root of 1142421557 is about 33799.7271734551. The cubic root of 1142421557 is about 1045.3830717860.

Adding to 1142421557 its reverse (7551242411), we get a palindrome (8693663968).

The spelling of 1142421557 in words is "one billion, one hundred forty-two million, four hundred twenty-one thousand, five hundred fifty-seven".