1257220181 has 8 divisors (see below), whose sum is σ = 1499293824. Its totient is φ = 1030764240.

The previous prime is 1257220171. The next prime is 1257220199. The reversal of 1257220181 is 1810227521.

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

It is a cyclic number.

It is not a de Polignac number, because 1257220181 - 2²⁶ = 1190111317 is a prime.

It is a super-2 number, since 2×1257220181² = 3161205167027345522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257220171) 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 7 ways as a sum of consecutive naturals, for example, 3904250 + ... + 3904571.

It is an arithmetic number, because the mean of its divisors is an integer number (187411728).

Almost surely, 2^1257220181 is an apocalyptic number.

It is an amenable number.

1257220181 is a deficient number, since it is larger than the sum of its proper divisors (242073643).

1257220181 is an equidigital number, since it uses as much as digits as its factorization.

1257220181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808851.

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

The square root of 1257220181 is about 35457.3008137957. The cubic root of 1257220181 is about 1079.2874188903.

The spelling of 1257220181 in words is "one billion, two hundred fifty-seven million, two hundred twenty thousand, one hundred eighty-one".