1220542401 has 32 divisors (see below), whose sum is σ = 1855244160. Its totient is φ = 708309504.

The previous prime is 1220542397. The next prime is 1220542423. The reversal of 1220542401 is 1042450221.

It is not a de Polignac number, because 1220542401 - 2² = 1220542397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220542441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36085 + ... + 61181.

It is an arithmetic number, because the mean of its divisors is an integer number (57976380).

Almost surely, 2^1220542401 is an apocalyptic number.

It is an amenable number.

1220542401 is a deficient number, since it is larger than the sum of its proper divisors (634701759).

1220542401 is a wasteful number, since it uses less digits than its factorization.

1220542401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25185.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1220542401 is about 34936.2619780651. The cubic root of 1220542401 is about 1068.6880595818.

Adding to 1220542401 its reverse (1042450221), we get a palindrome (2262992622).

The spelling of 1220542401 in words is "one billion, two hundred twenty million, five hundred forty-two thousand, four hundred one".