1994671257 has 4 divisors (see below), whose sum is σ = 2659561680. Its totient is φ = 1329780836.

The previous prime is 1994671253. The next prime is 1994671291. The reversal of 1994671257 is 7521764991.

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 1994671257 - 2² = 1994671253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1994671253) 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, 332445207 + ... + 332445212.

It is an arithmetic number, because the mean of its divisors is an integer number (664890420).

Almost surely, 2^1994671257 is an apocalyptic number.

It is an amenable number.

1994671257 is a deficient number, since it is larger than the sum of its proper divisors (664890423).

1994671257 is an equidigital number, since it uses as much as digits as its factorization.

1994671257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664890422.

The product of its digits is 952560, while the sum is 51.

The square root of 1994671257 is about 44661.7426552077. The cubic root of 1994671257 is about 1258.8010887284.

The spelling of 1994671257 in words is "one billion, nine hundred ninety-four million, six hundred seventy-one thousand, two hundred fifty-seven".