1220909957 has 2 divisors, whose sum is σ = 1220909958. Its totient is φ = 1220909956.

The previous prime is 1220909939. The next prime is 1220910001. The reversal of 1220909957 is 7599090221.

It is a happy number.

It is an a-pointer prime, because the next prime (1220910001) can be obtained adding 1220909957 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217032996 + 3876961 = 34886^2 + 1969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220909957 is a prime.

It is a super-2 number, since 2×1220909957² = 2981242246203483698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220909257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610454978 + 610454979.

It is an arithmetic number, because the mean of its divisors is an integer number (610454979).

Almost surely, 2^1220909957 is an apocalyptic number.

It is an amenable number.

1220909957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220909957 is an equidigital number, since it uses as much as digits as its factorization.

1220909957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 1220909957 is about 34941.5219617005. The cubic root of 1220909957 is about 1068.7953242659.

The spelling of 1220909957 in words is "one billion, two hundred twenty million, nine hundred nine thousand, nine hundred fifty-seven".