990717157 has 4 divisors (see below), whose sum is σ = 1033791840. Its totient is φ = 947642476.

The previous prime is 990717151. The next prime is 990717179. The reversal of 990717157 is 751717099.

990717157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 990717157 - 2³ = 990717149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990717151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21537307 + ... + 21537352.

It is an arithmetic number, because the mean of its divisors is an integer number (258447960).

Almost surely, 2^990717157 is an apocalyptic number.

It is an amenable number.

990717157 is a deficient number, since it is larger than the sum of its proper divisors (43074683).

990717157 is a wasteful number, since it uses less digits than its factorization.

990717157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43074682.

The product of its (nonzero) digits is 138915, while the sum is 46.

The square root of 990717157 is about 31475.6597548010. The cubic root of 990717157 is about 996.8960947400.

The spelling of 990717157 in words is "nine hundred ninety million, seven hundred seventeen thousand, one hundred fifty-seven".