1216372573 has 4 divisors (see below), whose sum is σ = 1309939708. Its totient is φ = 1122805440.

The previous prime is 1216372561. The next prime is 1216372603. The reversal of 1216372573 is 3752736121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67026969 + 1149345604 = 8187^2 + 33902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216372573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216376573) 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, 46783548 + ... + 46783573.

It is an arithmetic number, because the mean of its divisors is an integer number (327484927).

Almost surely, 2^1216372573 is an apocalyptic number.

1216372573 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1216372573 is a deficient number, since it is larger than the sum of its proper divisors (93567135).

1216372573 is an equidigital number, since it uses as much as digits as its factorization.

1216372573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93567134.

The product of its digits is 52920, while the sum is 37.

The square root of 1216372573 is about 34876.5332709546. The cubic root of 1216372573 is about 1067.4696587091.

The spelling of 1216372573 in words is "one billion, two hundred sixteen million, three hundred seventy-two thousand, five hundred seventy-three".