1011220957 has 2 divisors, whose sum is σ = 1011220958. Its totient is φ = 1011220956.

The previous prime is 1011220949. The next prime is 1011220997. The reversal of 1011220957 is 7590221101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574369156 + 436851801 = 23966^2 + 20901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011220957 - 2³ = 1011220949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011220927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505610478 + 505610479.

It is an arithmetic number, because the mean of its divisors is an integer number (505610479).

Almost surely, 2^1011220957 is an apocalyptic number.

It is an amenable number.

1011220957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011220957 is an equidigital number, since it uses as much as digits as its factorization.

1011220957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 1011220957 is about 31799.7005803514. The cubic root of 1011220957 is about 1003.7264155784.

The spelling of 1011220957 in words is "one billion, eleven million, two hundred twenty thousand, nine hundred fifty-seven".