1256948197 has 4 divisors (see below), whose sum is σ = 1262584960. Its totient is φ = 1251311436.

The previous prime is 1256948191. The next prime is 1256948219. The reversal of 1256948197 is 7918496521.

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 1256948197 - 2¹¹ = 1256946149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256948191) 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, 2818047 + ... + 2818492.

It is an arithmetic number, because the mean of its divisors is an integer number (315646240).

Almost surely, 2^1256948197 is an apocalyptic number.

It is an amenable number.

1256948197 is a deficient number, since it is larger than the sum of its proper divisors (5636763).

1256948197 is an equidigital number, since it uses as much as digits as its factorization.

1256948197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636762.

The product of its digits is 1088640, while the sum is 52.

The square root of 1256948197 is about 35453.4652326116. The cubic root of 1256948197 is about 1079.2095831262.

The spelling of 1256948197 in words is "one billion, two hundred fifty-six million, nine hundred forty-eight thousand, one hundred ninety-seven".