1098491377 has 4 divisors (see below), whose sum is σ = 1136370420. Its totient is φ = 1060612336.

The previous prime is 1098491369. The next prime is 1098491411. The reversal of 1098491377 is 7731948901.

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

It can be written as a sum of positive squares in 2 ways, for example, as 191517921 + 906973456 = 13839^2 + 30116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098491377 - 2³ = 1098491369 is a prime.

It is a super-2 number, since 2×1098491377² = 2413366610686712258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1098491377.

It is not an unprimeable number, because it can be changed into a prime (1098491347) 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, 18939478 + ... + 18939535.

It is an arithmetic number, because the mean of its divisors is an integer number (284092605).

Almost surely, 2^1098491377 is an apocalyptic number.

It is an amenable number.

1098491377 is a deficient number, since it is larger than the sum of its proper divisors (37879043).

1098491377 is an equidigital number, since it uses as much as digits as its factorization.

1098491377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37879042.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 1098491377 is about 33143.4967527568. The cubic root of 1098491377 is about 1031.8079839381.

The spelling of 1098491377 in words is "one billion, ninety-eight million, four hundred ninety-one thousand, three hundred seventy-seven".