1220312451 has 8 divisors (see below), whose sum is σ = 1627764480. Its totient is φ = 813201032.

The previous prime is 1220312407. The next prime is 1220312459. The reversal of 1220312451 is 1542130221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220312451 - 2⁷ = 1220312323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220312459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76671 + ... + 91208.

It is an arithmetic number, because the mean of its divisors is an integer number (203470560).

Almost surely, 2^1220312451 is an apocalyptic number.

1220312451 is a deficient number, since it is larger than the sum of its proper divisors (407452029).

1220312451 is a wasteful number, since it uses less digits than its factorization.

1220312451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170305.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1220312451 is about 34932.9708298622. The cubic root of 1220312451 is about 1068.6209418115.

Adding to 1220312451 its reverse (1542130221), we get a palindrome (2762442672).

The spelling of 1220312451 in words is "one billion, two hundred twenty million, three hundred twelve thousand, four hundred fifty-one".