1220023251 has 6 divisors (see below), whose sum is σ = 1762255820. Its totient is φ = 813348828.

The previous prime is 1220023213. The next prime is 1220023253. The reversal of 1220023251 is 1523200221.

It is not a de Polignac number, because 1220023251 - 2¹¹ = 1220021203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220023253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67779061 + ... + 67779078.

Almost surely, 2^1220023251 is an apocalyptic number.

1220023251 is a deficient number, since it is larger than the sum of its proper divisors (542232569).

1220023251 is a wasteful number, since it uses less digits than its factorization.

1220023251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135558145 (or 135558142 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1220023251 is about 34928.8312286569. The cubic root of 1220023251 is about 1068.5365181890.

Adding to 1220023251 its reverse (1523200221), we get a palindrome (2743223472).

The spelling of 1220023251 in words is "one billion, two hundred twenty million, twenty-three thousand, two hundred fifty-one".