1098979951 has 4 divisors (see below), whose sum is σ = 1146761712. Its totient is φ = 1051198192.

The previous prime is 1098979933. The next prime is 1098979967. The reversal of 1098979951 is 1599798901.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1098979951 - 2⁵ = 1098979919 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 (1098979901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23890846 + ... + 23890891.

It is an arithmetic number, because the mean of its divisors is an integer number (286690428).

Almost surely, 2^1098979951 is an apocalyptic number.

1098979951 is a deficient number, since it is larger than the sum of its proper divisors (47781761).

1098979951 is an equidigital number, since it uses as much as digits as its factorization.

1098979951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47781760.

The product of its (nonzero) digits is 1837080, while the sum is 58.

The square root of 1098979951 is about 33150.8665195949. The cubic root of 1098979951 is about 1031.9609330478.

The spelling of 1098979951 in words is "one billion, ninety-eight million, nine hundred seventy-nine thousand, nine hundred fifty-one".