1220858137 has 2 divisors, whose sum is σ = 1220858138. Its totient is φ = 1220858136.

The previous prime is 1220858117. The next prime is 1220858141. The reversal of 1220858137 is 7318580221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952586496 + 268271641 = 30864^2 + 16379^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220858137 - 2¹¹ = 1220856089 is a prime.

It is a super-2 number, since 2×1220858137² = 2980989181358221538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220858096 and 1220858105.

It is not a weakly prime, because it can be changed into another prime (1220858117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610429068 + 610429069.

It is an arithmetic number, because the mean of its divisors is an integer number (610429069).

Almost surely, 2^1220858137 is an apocalyptic number.

It is an amenable number.

1220858137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220858137 is an equidigital number, since it uses as much as digits as its factorization.

1220858137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1220858137 is about 34940.7804291776. The cubic root of 1220858137 is about 1068.7802028239.

The spelling of 1220858137 in words is "one billion, two hundred twenty million, eight hundred fifty-eight thousand, one hundred thirty-seven".