156994793 has 2 divisors, whose sum is σ = 156994794. Its totient is φ = 156994792.

The previous prime is 156994769. The next prime is 156994823. The reversal of 156994793 is 397499651.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93760489 + 63234304 = 9683^2 + 7952^2 .

It is an emirp because it is prime and its reverse (397499651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156994793 - 2¹⁶ = 156929257 is a prime.

It is a super-2 number, since 2×156994793² = 49294730058225698, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (156994753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78497396 + 78497397.

It is an arithmetic number, because the mean of its divisors is an integer number (78497397).

Almost surely, 2^156994793 is an apocalyptic number.

It is an amenable number.

156994793 is a deficient number, since it is larger than the sum of its proper divisors (1).

156994793 is an equidigital number, since it uses as much as digits as its factorization.

156994793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The square root of 156994793 is about 12529.7563024985. The cubic root of 156994793 is about 539.4631072056.

The spelling of 156994793 in words is "one hundred fifty-six million, nine hundred ninety-four thousand, seven hundred ninety-three".