1220612951581 has 8 divisors (see below), whose sum is σ = 1230546530304. Its totient is φ = 1210684411440.

The previous prime is 1220612951563. The next prime is 1220612951609. The reversal of 1220612951581 is 1851592160221.

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 1220612951581 - 2³⁹ = 670857137693 is a prime.

It is a super-2 number, since 2×1220612951581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220612951561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772405 + ... + 1742938.

It is an arithmetic number, because the mean of its divisors is an integer number (153818316288).

Almost surely, 2^{1220612951581} is an apocalyptic number.

It is an amenable number.

1220612951581 is a deficient number, since it is larger than the sum of its proper divisors (9933578723).

1220612951581 is a wasteful number, since it uses less digits than its factorization.

1220612951581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519291.

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 1220612951581 in words is "one trillion, two hundred twenty billion, six hundred twelve million, nine hundred fifty-one thousand, five hundred eighty-one".