1220045761 has 8 divisors (see below), whose sum is σ = 1344138048. Its totient is φ = 1098150000.

The previous prime is 1220045759. The next prime is 1220045767. The reversal of 1220045761 is 1675400221.

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 1220045761 - 2¹ = 1220045759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220045767) 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, 547965 + ... + 550186.

It is an arithmetic number, because the mean of its divisors is an integer number (168017256).

Almost surely, 2^1220045761 is an apocalyptic number.

1220045761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220045761 is a deficient number, since it is larger than the sum of its proper divisors (124092287).

1220045761 is a wasteful number, since it uses less digits than its factorization.

1220045761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098263.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1220045761 is about 34929.1534538128. The cubic root of 1220045761 is about 1068.5430898149.

Adding to 1220045761 its reverse (1675400221), we get a palindrome (2895445982).

It can be divided in two parts, 122004 and 5761, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 1220045761 in words is "one billion, two hundred twenty million, forty-five thousand, seven hundred sixty-one".