1948118691 has 4 divisors (see below), whose sum is σ = 2597491592. Its totient is φ = 1298745792.

The previous prime is 1948118681. The next prime is 1948118717. The reversal of 1948118691 is 1968118491.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1948118691 - 2¹³ = 1948110499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1948118691.

It is not an unprimeable number, because it can be changed into a prime (1948118611) 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, 324686446 + ... + 324686451.

It is an arithmetic number, because the mean of its divisors is an integer number (649372898).

Almost surely, 2^1948118691 is an apocalyptic number.

1948118691 is a deficient number, since it is larger than the sum of its proper divisors (649372901).

1948118691 is an equidigital number, since it uses as much as digits as its factorization.

1948118691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649372900.

The product of its digits is 124416, while the sum is 48.

The square root of 1948118691 is about 44137.4975615972. The cubic root of 1948118691 is about 1248.9310735910.

The spelling of 1948118691 in words is "one billion, nine hundred forty-eight million, one hundred eighteen thousand, six hundred ninety-one".