156780649 has 2 divisors, whose sum is σ = 156780650. Its totient is φ = 156780648.

The previous prime is 156780619. The next prime is 156780661. The reversal of 156780649 is 946087651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156075049 + 705600 = 12493^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 156780649 - 2⁷ = 156780521 is a prime.

It is a super-2 number, since 2×156780649² = 49160343801722402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 156780599 and 156780608.

It is not a weakly prime, because it can be changed into another prime (156780619) 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, 78390324 + 78390325.

It is an arithmetic number, because the mean of its divisors is an integer number (78390325).

Almost surely, 2^156780649 is an apocalyptic number.

It is an amenable number.

156780649 is a deficient number, since it is larger than the sum of its proper divisors (1).

156780649 is an equidigital number, since it uses as much as digits as its factorization.

156780649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 156780649 is about 12521.2079688822. The cubic root of 156780649 is about 539.2177161529.

The spelling of 156780649 in words is "one hundred fifty-six million, seven hundred eighty thousand, six hundred forty-nine".