988591501 has 2 divisors, whose sum is σ = 988591502. Its totient is φ = 988591500.

The previous prime is 988591453. The next prime is 988591529. The reversal of 988591501 is 105195889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 895565476 + 93026025 = 29926^2 + 9645^2 .

It is an emirp because it is prime and its reverse (105195889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 988591501 - 2¹¹ = 988589453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988591001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494295750 + 494295751.

It is an arithmetic number, because the mean of its divisors is an integer number (494295751).

Almost surely, 2^988591501 is an apocalyptic number.

It is an amenable number.

988591501 is a deficient number, since it is larger than the sum of its proper divisors (1).

988591501 is an equidigital number, since it uses as much as digits as its factorization.

988591501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 46.

The square root of 988591501 is about 31441.8749599956. The cubic root of 988591501 is about 996.1826131001.

The spelling of 988591501 in words is "nine hundred eighty-eight million, five hundred ninety-one thousand, five hundred one".