156796561 has 2 divisors, whose sum is σ = 156796562. Its totient is φ = 156796560.

The previous prime is 156796553. The next prime is 156796567. The reversal of 156796561 is 165697651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107516161 + 49280400 = 10369^2 + 7020^2 .

It is a cyclic number.

It is not a de Polignac number, because 156796561 - 2³ = 156796553 is a prime.

It is not a weakly prime, because it can be changed into another prime (156796567) 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, 78398280 + 78398281.

It is an arithmetic number, because the mean of its divisors is an integer number (78398281).

Almost surely, 2^156796561 is an apocalyptic number.

It is an amenable number.

156796561 is a deficient number, since it is larger than the sum of its proper divisors (1).

156796561 is an equidigital number, since it uses as much as digits as its factorization.

156796561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 46.

The square root of 156796561 is about 12521.8433547142. The cubic root of 156796561 is about 539.2359576517.

The spelling of 156796561 in words is "one hundred fifty-six million, seven hundred ninety-six thousand, five hundred sixty-one".