1220022551 has 8 divisors (see below), whose sum is σ = 1341934608. Its totient is φ = 1109110200.

The previous prime is 1220022541. The next prime is 1220022553. The reversal of 1220022551 is 1552200221.

It is a happy number.

It is not a de Polignac number, because 1220022551 - 2⁶ = 1220022487 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 (1220022553) 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, 456980 + ... + 459641.

It is an arithmetic number, because the mean of its divisors is an integer number (167741826).

Almost surely, 2^1220022551 is an apocalyptic number.

1220022551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220022551 is a deficient number, since it is larger than the sum of its proper divisors (121912057).

1220022551 is an frugal number, since it uses more digits than its factorization.

1220022551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916654 (or 916632 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1220022551 is about 34928.8212082801. The cubic root of 1220022551 is about 1068.5363138280.

Adding to 1220022551 its reverse (1552200221), we get a palindrome (2772222772).

The spelling of 1220022551 in words is "one billion, two hundred twenty million, twenty-two thousand, five hundred fifty-one".