198157519 has 6 divisors (see below), whose sum is σ = 230509824. Its totient is φ = 169849260.

The previous prime is 198157481. The next prime is 198157541. The reversal of 198157519 is 915751891.

It is not a de Polignac number, because 198157519 - 2⁹ = 198157007 is a prime.

It is a super-2 number, since 2×198157519² = 78532804672470722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198157579) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2021967 + ... + 2022064.

It is an arithmetic number, because the mean of its divisors is an integer number (38418304).

Almost surely, 2^198157519 is an apocalyptic number.

198157519 is a deficient number, since it is larger than the sum of its proper divisors (32352305).

198157519 is an equidigital number, since it uses as much as digits as its factorization.

198157519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044045 (or 4044038 counting only the distinct ones).

The product of its digits is 113400, while the sum is 46.

The square root of 198157519 is about 14076.8433606402. The cubic root of 198157519 is about 583.0021889417.

The spelling of 198157519 in words is "one hundred ninety-eight million, one hundred fifty-seven thousand, five hundred nineteen".