1291192498 has 4 divisors (see below), whose sum is σ = 1936788750. Its totient is φ = 645596248.

The previous prime is 1291192493. The next prime is 1291192499. The reversal of 1291192498 is 8942911921.

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

It can be written as a sum of positive squares in only one way, i.e., 1261457289 + 29735209 = 35517^2 + 5453^2 .

It is not an unprimeable number, because it can be changed into a prime (1291192493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322798123 + ... + 322798126.

Almost surely, 2^1291192498 is an apocalyptic number.

1291192498 is a deficient number, since it is larger than the sum of its proper divisors (645596252).

1291192498 is an equidigital number, since it uses as much as digits as its factorization.

1291192498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645596251.

The product of its digits is 93312, while the sum is 46.

The square root of 1291192498 is about 35933.1671022747. The cubic root of 1291192498 is about 1088.9225663462.

The spelling of 1291192498 in words is "one billion, two hundred ninety-one million, one hundred ninety-two thousand, four hundred ninety-eight".