1220999971 has 8 divisors (see below), whose sum is σ = 1247481344. Its totient is φ = 1194782400.

The previous prime is 1220999953. The next prime is 1220999977. The reversal of 1220999971 is 1799990221.

It is a happy number.

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 1220999971 - 2¹⁵ = 1220967203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220999977) 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, 56580 + ... + 75121.

It is an arithmetic number, because the mean of its divisors is an integer number (155935168).

Almost surely, 2^1220999971 is an apocalyptic number.

1220999971 is a deficient number, since it is larger than the sum of its proper divisors (26481373).

1220999971 is a wasteful number, since it uses less digits than its factorization.

1220999971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131901.

The product of its (nonzero) digits is 183708, while the sum is 49.

The square root of 1220999971 is about 34942.8100043485. The cubic root of 1220999971 is about 1068.8215899698.

The spelling of 1220999971 in words is "one billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred seventy-one".