1198215137 has 4 divisors (see below), whose sum is σ = 1369388736. Its totient is φ = 1027041540.

The previous prime is 1198215121. The next prime is 1198215169. The reversal of 1198215137 is 7315128911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1198215137 - 2⁴ = 1198215121 is a prime.

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 1198215137.

It is not an unprimeable number, because it can be changed into a prime (1198215737) 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, 85586789 + ... + 85586802.

It is an arithmetic number, because the mean of its divisors is an integer number (342347184).

Almost surely, 2^1198215137 is an apocalyptic number.

It is an amenable number.

1198215137 is a deficient number, since it is larger than the sum of its proper divisors (171173599).

1198215137 is an equidigital number, since it uses as much as digits as its factorization.

1198215137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171173598.

The product of its digits is 15120, while the sum is 38.

The square root of 1198215137 is about 34615.2442862968. The cubic root of 1198215137 is about 1062.1314466508.

The spelling of 1198215137 in words is "one billion, one hundred ninety-eight million, two hundred fifteen thousand, one hundred thirty-seven".