99742157 has 2 divisors, whose sum is σ = 99742158. Its totient is φ = 99742156.

The previous prime is 99742147. The next prime is 99742169. The reversal of 99742157 is 75124799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71588521 + 28153636 = 8461^2 + 5306^2 .

It is a cyclic number.

It is not a de Polignac number, because 99742157 - 2⁴ = 99742141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99742127) 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, 49871078 + 49871079.

It is an arithmetic number, because the mean of its divisors is an integer number (49871079).

Almost surely, 2^99742157 is an apocalyptic number.

It is an amenable number.

99742157 is a deficient number, since it is larger than the sum of its proper divisors (1).

99742157 is an equidigital number, since it uses as much as digits as its factorization.

99742157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 99742157 is about 9987.0995288923. The cubic root of 99742157 is about 463.7596062652.

It can be divided in two parts, 99742 and 157, that added together give a palindrome (99899).

The spelling of 99742157 in words is "ninety-nine million, seven hundred forty-two thousand, one hundred fifty-seven".