219251507049 has 15 divisors (see below), whose sum is σ = 327530151597. Its totient is φ = 146164861908.

The previous prime is 219251507023. The next prime is 219251507071. The reversal of 219251507049 is 940705152912.

The square root of 219251507049 is 468243.

It is a perfect power (a square), and thus also a powerful number.

219251507049 is a `hidden beast` number, since 2 + 1 + 92 + 51 + 507 + 0 + 4 + 9 = 666.

It is not a de Polignac number, because 219251507049 - 2⁵ = 219251507017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 219251506995 and 219251507013.

It is not an unprimeable number, because it can be changed into a prime (219251507089) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4188174 + ... + 4240200.

Almost surely, 2^219251507049 is an apocalyptic number.

219251507049 is the 468243-rd square number.

219251507049 is the 234122-nd centered octagonal number.

It is an amenable number.

219251507049 is a deficient number, since it is larger than the sum of its proper divisors (108278644548).

219251507049 is an frugal number, since it uses more digits than its factorization.

219251507049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104066 (or 52030 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 219251507049 in words is "two hundred nineteen billion, two hundred fifty-one million, five hundred seven thousand, forty-nine".