1257131078 has 8 divisors (see below), whose sum is σ = 2155081872. Its totient is φ = 538770456.

The previous prime is 1257131059. The next prime is 1257131087. The reversal of 1257131078 is 8701317521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44897525 + ... + 44897552.

It is an arithmetic number, because the mean of its divisors is an integer number (269385234).

Almost surely, 2^1257131078 is an apocalyptic number.

1257131078 is a deficient number, since it is larger than the sum of its proper divisors (897950794).

1257131078 is an equidigital number, since it uses as much as digits as its factorization.

1257131078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89795086.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 1257131078 is about 35456.0443084109. The cubic root of 1257131078 is about 1079.2619208324.

Adding to 1257131078 its reverse (8701317521), we get a palindrome (9958448599).

The spelling of 1257131078 in words is "one billion, two hundred fifty-seven million, one hundred thirty-one thousand, seventy-eight".