1157645998 has 4 divisors (see below), whose sum is σ = 1736469000. Its totient is φ = 578822998.

The previous prime is 1157645987. The next prime is 1157645999. The reversal of 1157645998 is 8995467511.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157645999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 289411498 + ... + 289411501.

It is an arithmetic number, because the mean of its divisors is an integer number (434117250).

Almost surely, 2^1157645998 is an apocalyptic number.

1157645998 is a deficient number, since it is larger than the sum of its proper divisors (578823002).

1157645998 is an equidigital number, since it uses as much as digits as its factorization.

1157645998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578823001.

The product of its digits is 2721600, while the sum is 55.

The square root of 1157645998 is about 34024.1972425508. The cubic root of 1157645998 is about 1050.0063485633.

The spelling of 1157645998 in words is "one billion, one hundred fifty-seven million, six hundred forty-five thousand, nine hundred ninety-eight".