156840001 has 2 divisors, whose sum is σ = 156840002. Its totient is φ = 156840000.

The previous prime is 156839999. The next prime is 156840029. The reversal of 156840001 is 100048651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141039376 + 15800625 = 11876^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 156840001 - 2¹ = 156839999 is a prime.

Together with 156839999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (156840071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78420000 + 78420001.

It is an arithmetic number, because the mean of its divisors is an integer number (78420001).

Almost surely, 2^156840001 is an apocalyptic number.

It is an amenable number.

156840001 is a deficient number, since it is larger than the sum of its proper divisors (1).

156840001 is an equidigital number, since it uses as much as digits as its factorization.

156840001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 156840001 is about 12523.5778034873. The cubic root of 156840001 is about 539.2857509357.

Adding to 156840001 its reverse (100048651), we get a palindrome (256888652).

The spelling of 156840001 in words is "one hundred fifty-six million, eight hundred forty thousand, one".