1252640191 has 16 divisors (see below), whose sum is σ = 1429602048. Its totient is φ = 1086448000.

The previous prime is 1252640161. The next prime is 1252640261. The reversal of 1252640191 is 1910462521.

It is not a de Polignac number, because 1252640191 - 2²⁹ = 715769279 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 (1252640111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95280 + ... + 107626.

It is an arithmetic number, because the mean of its divisors is an integer number (89350128).

Almost surely, 2^1252640191 is an apocalyptic number.

1252640191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1252640191 is a deficient number, since it is larger than the sum of its proper divisors (176961857).

1252640191 is a wasteful number, since it uses less digits than its factorization.

1252640191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12782.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1252640191 is about 35392.6573034577. The cubic root of 1252640191 is about 1077.9752275554.

The spelling of 1252640191 in words is "one billion, two hundred fifty-two million, six hundred forty thousand, one hundred ninety-one".