99742637 has 2 divisors, whose sum is σ = 99742638. Its totient is φ = 99742636.

The previous prime is 99742619. The next prime is 99742663. The reversal of 99742637 is 73624799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96452041 + 3290596 = 9821^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 99742637 - 2¹⁰ = 99741613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99742591 and 99742600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99742337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49871318 + 49871319.

It is an arithmetic number, because the mean of its divisors is an integer number (49871319).

Almost surely, 2^99742637 is an apocalyptic number.

It is an amenable number.

99742637 is a deficient number, since it is larger than the sum of its proper divisors (1).

99742637 is an equidigital number, since it uses as much as digits as its factorization.

99742637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 47.

The square root of 99742637 is about 9987.1235598645. The cubic root of 99742637 is about 463.7603501975.

It can be divided in two parts, 997 and 42637, that added together give a palindrome (43634).

The spelling of 99742637 in words is "ninety-nine million, seven hundred forty-two thousand, six hundred thirty-seven".