12157001 has 2 divisors, whose sum is σ = 12157002. Its totient is φ = 12157000.

The previous prime is 12156983. The next prime is 12157027. The reversal of 12157001 is 10075121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7974976 + 4182025 = 2824^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 12157001 - 2¹⁰ = 12155977 is a prime.

It is not a weakly prime, because it can be changed into another prime (12157801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6078500 + 6078501.

It is an arithmetic number, because the mean of its divisors is an integer number (6078501).

Almost surely, 2^12157001 is an apocalyptic number.

It is an amenable number.

12157001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12157001 is an equidigital number, since it uses as much as digits as its factorization.

12157001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 12157001 is about 3486.6891171999. The cubic root of 12157001 is about 229.9369770614.

The spelling of 12157001 in words is "twelve million, one hundred fifty-seven thousand, one".