1220654251 has 4 divisors (see below), whose sum is σ = 1221242904. Its totient is φ = 1220065600.

The previous prime is 1220654231. The next prime is 1220654291. The reversal of 1220654251 is 1524560221.

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 1220654251 - 2⁹ = 1220653739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220654231) 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, 291205 + ... + 295366.

It is an arithmetic number, because the mean of its divisors is an integer number (305310726).

Almost surely, 2^1220654251 is an apocalyptic number.

1220654251 is a deficient number, since it is larger than the sum of its proper divisors (588653).

1220654251 is an equidigital number, since it uses as much as digits as its factorization.

1220654251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588652.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1220654251 is about 34937.8627136807. The cubic root of 1220654251 is about 1068.7207032950.

The spelling of 1220654251 in words is "one billion, two hundred twenty million, six hundred fifty-four thousand, two hundred fifty-one".