1257081401 has 16 divisors (see below), whose sum is σ = 1384689600. Its totient is φ = 1136835648.

The previous prime is 1257081391. The next prime is 1257081431. The reversal of 1257081401 is 1041807521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257081401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1257081431) 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, 20390 + ... + 54128.

It is an arithmetic number, because the mean of its divisors is an integer number (86543100).

Almost surely, 2^1257081401 is an apocalyptic number.

It is an amenable number.

1257081401 is a deficient number, since it is larger than the sum of its proper divisors (127608199).

1257081401 is a wasteful number, since it uses less digits than its factorization.

1257081401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33848.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1257081401 is about 35455.3437580289. The cubic root of 1257081401 is about 1079.2477045476.

Adding to 1257081401 its reverse (1041807521), we get a palindrome (2298888922).

The spelling of 1257081401 in words is "one billion, two hundred fifty-seven million, eighty-one thousand, four hundred one".