1257212431 has 4 divisors (see below), whose sum is σ = 1268746600. Its totient is φ = 1245678264.

The previous prime is 1257212423. The next prime is 1257212459. The reversal of 1257212431 is 1342127521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1342127521 = 7 ⋅191732503.

It is a cyclic number.

It is not a de Polignac number, because 1257212431 - 2³ = 1257212423 is a prime.

It is a super-2 number, since 2×1257212431² = 3161166193321859522, which contains 22 as substring.

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 1257212431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257212401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5766921 + ... + 5767138.

It is an arithmetic number, because the mean of its divisors is an integer number (317186650).

Almost surely, 2^1257212431 is an apocalyptic number.

1257212431 is a deficient number, since it is larger than the sum of its proper divisors (11534169).

1257212431 is a wasteful number, since it uses less digits than its factorization.

1257212431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11534168.

The product of its digits is 3360, while the sum is 28.

The square root of 1257212431 is about 35457.1915272487. The cubic root of 1257212431 is about 1079.2852011683.

Adding to 1257212431 its reverse (1342127521), we get a palindrome (2599339952).

The spelling of 1257212431 in words is "one billion, two hundred fifty-seven million, two hundred twelve thousand, four hundred thirty-one".