1257131077 has 4 divisors (see below), whose sum is σ = 1264658976. Its totient is φ = 1249603180.

The previous prime is 1257131059. The next prime is 1257131087. The reversal of 1257131077 is 7701317521.

It is a happy number.

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 1257131077 - 2¹⁹ = 1256606789 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 (1257131017) 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, 3763699 + ... + 3764032.

It is an arithmetic number, because the mean of its divisors is an integer number (316164744).

Almost surely, 2^1257131077 is an apocalyptic number.

It is an amenable number.

1257131077 is a deficient number, since it is larger than the sum of its proper divisors (7527899).

1257131077 is an equidigital number, since it uses as much as digits as its factorization.

1257131077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527898.

The product of its (nonzero) digits is 10290, while the sum is 34.

The square root of 1257131077 is about 35456.0442943090. The cubic root of 1257131077 is about 1079.2619205463.

Adding to 1257131077 its reverse (7701317521), we get a palindrome (8958448598).

The spelling of 1257131077 in words is "one billion, two hundred fifty-seven million, one hundred thirty-one thousand, seventy-seven".