1220858131 has 4 divisors (see below), whose sum is σ = 1221752592. Its totient is φ = 1219963672.

The previous prime is 1220858117. The next prime is 1220858137. The reversal of 1220858131 is 1318580221.

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 1220858131 - 2⁵ = 1220858099 is a prime.

It is a super-2 number, since 2×1220858131² = 2980989152057626322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220858093 and 1220858102.

It is not an unprimeable number, because it can be changed into a prime (1220858137) 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, 445180 + ... + 447913.

It is an arithmetic number, because the mean of its divisors is an integer number (305438148).

Almost surely, 2^1220858131 is an apocalyptic number.

1220858131 is a deficient number, since it is larger than the sum of its proper divisors (894461).

1220858131 is an equidigital number, since it uses as much as digits as its factorization.

1220858131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894460.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 1220858131 is about 34940.7803433180. The cubic root of 1220858131 is about 1068.7802010731.

The spelling of 1220858131 in words is "one billion, two hundred twenty million, eight hundred fifty-eight thousand, one hundred thirty-one".