1098978897 has 16 divisors (see below), whose sum is σ = 1477667520. Its totient is φ = 726484992.

The previous prime is 1098978877. The next prime is 1098978953. The reversal of 1098978897 is 7988798901.

It is a de Polignac number, because none of the positive numbers 2^k-1098978897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1098978817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646753 + ... + 648449.

It is an arithmetic number, because the mean of its divisors is an integer number (92354220).

Almost surely, 2^1098978897 is an apocalyptic number.

It is an amenable number.

1098978897 is a deficient number, since it is larger than the sum of its proper divisors (378688623).

1098978897 is a wasteful number, since it uses less digits than its factorization.

1098978897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392.

The product of its (nonzero) digits is 18289152, while the sum is 66.

The square root of 1098978897 is about 33150.8506225708. The cubic root of 1098978897 is about 1031.9606031397.

The spelling of 1098978897 in words is "one billion, ninety-eight million, nine hundred seventy-eight thousand, eight hundred ninety-seven".