1225199521 has 8 divisors (see below), whose sum is σ = 1507937984. Its totient is φ = 969388560.

The previous prime is 1225199519. The next prime is 1225199533. The reversal of 1225199521 is 1259915221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225199521 - 2¹ = 1225199519 is a prime.

It is a super-2 number, since 2×1225199521² = 3002227732517258882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1225199551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6731775 + ... + 6731956.

It is an arithmetic number, because the mean of its divisors is an integer number (188492248).

Almost surely, 2^1225199521 is an apocalyptic number.

It is an amenable number.

1225199521 is a deficient number, since it is larger than the sum of its proper divisors (282738463).

1225199521 is a wasteful number, since it uses less digits than its factorization.

1225199521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13463751.

The product of its digits is 16200, while the sum is 37.

The square root of 1225199521 is about 35002.8501839493. The cubic root of 1225199521 is about 1070.0455685604.

The spelling of 1225199521 in words is "one billion, two hundred twenty-five million, one hundred ninety-nine thousand, five hundred twenty-one".