988633491 has 4 divisors (see below), whose sum is σ = 1318177992. Its totient is φ = 659088992.

The previous prime is 988633489. The next prime is 988633507. The reversal of 988633491 is 194336889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194336889 = 3 ⋅64778963.

It is a cyclic number.

It is not a de Polignac number, because 988633491 - 2¹ = 988633489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (988633421) 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, 164772246 + ... + 164772251.

It is an arithmetic number, because the mean of its divisors is an integer number (329544498).

Almost surely, 2^988633491 is an apocalyptic number.

988633491 is a deficient number, since it is larger than the sum of its proper divisors (329544501).

988633491 is a wasteful number, since it uses less digits than its factorization.

988633491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329544500.

The product of its digits is 1119744, while the sum is 51.

The square root of 988633491 is about 31442.5426929821. The cubic root of 988633491 is about 996.1967170435.

The spelling of 988633491 in words is "nine hundred eighty-eight million, six hundred thirty-three thousand, four hundred ninety-one".