1019391641 has 4 divisors (see below), whose sum is σ = 1031673552. Its totient is φ = 1007109732.

The previous prime is 1019391619. The next prime is 1019391683. The reversal of 1019391641 is 1461939101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1019391641 - 2⁶ = 1019391577 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 (1019391341) 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, 6140831 + ... + 6140996.

It is an arithmetic number, because the mean of its divisors is an integer number (257918388).

Almost surely, 2^1019391641 is an apocalyptic number.

It is an amenable number.

1019391641 is a deficient number, since it is larger than the sum of its proper divisors (12281911).

1019391641 is an equidigital number, since it uses as much as digits as its factorization.

1019391641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12281910.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 1019391641 is about 31927.9131951965. The cubic root of 1019391641 is about 1006.4225429672.

The spelling of 1019391641 in words is "one billion, nineteen million, three hundred ninety-one thousand, six hundred forty-one".