1220275545 has 32 divisors (see below), whose sum is σ = 1989356544. Its totient is φ = 638616000.

The previous prime is 1220275531. The next prime is 1220275547. The reversal of 1220275545 is 5455720221.

It is not a de Polignac number, because 1220275545 - 2⁷ = 1220275417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220275547) 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, 184750 + ... + 191240.

It is an arithmetic number, because the mean of its divisors is an integer number (62167392).

Almost surely, 2^1220275545 is an apocalyptic number.

1220275545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220275545 is a deficient number, since it is larger than the sum of its proper divisors (769080999).

1220275545 is a wasteful number, since it uses less digits than its factorization.

1220275545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733.

The product of its (nonzero) digits is 28000, while the sum is 33.

The square root of 1220275545 is about 34932.4425856538. The cubic root of 1220275545 is about 1068.6101689087.

Adding to 1220275545 its reverse (5455720221), we get a palindrome (6675995766).

The spelling of 1220275545 in words is "one billion, two hundred twenty million, two hundred seventy-five thousand, five hundred forty-five".