1142017991 has 2 divisors, whose sum is σ = 1142017992. Its totient is φ = 1142017990.

The previous prime is 1142017979. The next prime is 1142017997. The reversal of 1142017991 is 1997102411.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1142017991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1142017997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571008995 + 571008996.

It is an arithmetic number, because the mean of its divisors is an integer number (571008996).

Almost surely, 2^1142017991 is an apocalyptic number.

1142017991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142017991 is an equidigital number, since it uses as much as digits as its factorization.

1142017991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1142017991 is about 33793.7566867018. The cubic root of 1142017991 is about 1045.2599617282.

The spelling of 1142017991 in words is "one billion, one hundred forty-two million, seventeen thousand, nine hundred ninety-one".