998971501 has 4 divisors (see below), whose sum is σ = 1089787104. Its totient is φ = 908155900.

The previous prime is 998971499. The next prime is 998971513. The reversal of 998971501 is 105179899.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 105179899 = 11 ⋅9561809.

It is a cyclic number.

It is not a de Polignac number, because 998971501 - 2¹ = 998971499 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 (998971301) 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, 45407785 + ... + 45407806.

It is an arithmetic number, because the mean of its divisors is an integer number (272446776).

Almost surely, 2^998971501 is an apocalyptic number.

It is an amenable number.

998971501 is a deficient number, since it is larger than the sum of its proper divisors (90815603).

998971501 is a wasteful number, since it uses less digits than its factorization.

998971501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90815602.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 998971501 is about 31606.5104211142. The cubic root of 998971501 is about 999.6570493983.

The spelling of 998971501 in words is "nine hundred ninety-eight million, nine hundred seventy-one thousand, five hundred one".