156261401 has 2 divisors, whose sum is σ = 156261402. Its totient is φ = 156261400.

The previous prime is 156261383. The next prime is 156261431. The reversal of 156261401 is 104162651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152497801 + 3763600 = 12349^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 156261401 - 2¹⁴ = 156245017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156261431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78130700 + 78130701.

It is an arithmetic number, because the mean of its divisors is an integer number (78130701).

Almost surely, 2^156261401 is an apocalyptic number.

It is an amenable number.

156261401 is a deficient number, since it is larger than the sum of its proper divisors (1).

156261401 is an equidigital number, since it uses as much as digits as its factorization.

156261401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 156261401 is about 12500.4560316814. The cubic root of 156261401 is about 538.6217723013.

The spelling of 156261401 in words is "one hundred fifty-six million, two hundred sixty-one thousand, four hundred one".