1201551220 has 12 divisors (see below), whose sum is σ = 2523257604. Its totient is φ = 480620480.

The previous prime is 1201551173. The next prime is 1201551251. The reversal of 1201551220 is 221551021.

It can be written as a sum of positive squares in 2 ways, for example, as 733434724 + 468116496 = 27082^2 + 21636^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30038761 + ... + 30038800.

It is an arithmetic number, because the mean of its divisors is an integer number (210271467).

Almost surely, 2^1201551220 is an apocalyptic number.

1201551220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201551220 is an abundant number, since it is smaller than the sum of its proper divisors (1321706384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201551220 is a wasteful number, since it uses less digits than its factorization.

1201551220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60077570 (or 60077568 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1201551220 is about 34663.3988523918. The cubic root of 1201551220 is about 1063.1162656941.

The spelling of 1201551220 in words is "one billion, two hundred one million, five hundred fifty-one thousand, two hundred twenty".