1220670671 has 4 divisors (see below), whose sum is σ = 1331640744. Its totient is φ = 1109700600.

The previous prime is 1220670653. The next prime is 1220670691. The reversal of 1220670671 is 1760760221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220670671 - 2¹⁰ = 1220669647 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 (1220670611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55485020 + ... + 55485041.

It is an arithmetic number, because the mean of its divisors is an integer number (332910186).

Almost surely, 2^1220670671 is an apocalyptic number.

1220670671 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220670671 is a deficient number, since it is larger than the sum of its proper divisors (110970073).

1220670671 is a wasteful number, since it uses less digits than its factorization.

1220670671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110970072.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 1220670671 is about 34938.0977015063. The cubic root of 1220670671 is about 1068.7254953469.

The spelling of 1220670671 in words is "one billion, two hundred twenty million, six hundred seventy thousand, six hundred seventy-one".