1291045942 has 4 divisors (see below), whose sum is σ = 1936568916. Its totient is φ = 645522970.

The previous prime is 1291045927. The next prime is 1291045979. The reversal of 1291045942 is 2495401921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2495401921 = 97 ⋅25725793.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322761484 + ... + 322761487.

It is an arithmetic number, because the mean of its divisors is an integer number (484142229).

Almost surely, 2^1291045942 is an apocalyptic number.

1291045942 is a deficient number, since it is larger than the sum of its proper divisors (645522974).

1291045942 is an equidigital number, since it uses as much as digits as its factorization.

1291045942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645522973.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1291045942 is about 35931.1277585327. The cubic root of 1291045942 is about 1088.8813656282.

The spelling of 1291045942 in words is "one billion, two hundred ninety-one million, forty-five thousand, nine hundred forty-two".