157921783 has 2 divisors, whose sum is σ = 157921784. Its totient is φ = 157921782.

The previous prime is 157921697. The next prime is 157921793. The reversal of 157921783 is 387129751.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157921783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157921793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78960891 + 78960892.

It is an arithmetic number, because the mean of its divisors is an integer number (78960892).

Almost surely, 2^157921783 is an apocalyptic number.

157921783 is a deficient number, since it is larger than the sum of its proper divisors (1).

157921783 is an equidigital number, since it uses as much as digits as its factorization.

157921783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 157921783 is about 12566.6933996179. The cubic root of 157921783 is about 540.5227938836.

The spelling of 157921783 in words is "one hundred fifty-seven million, nine hundred twenty-one thousand, seven hundred eighty-three".