1098211957 has 2 divisors, whose sum is σ = 1098211958. Its totient is φ = 1098211956.

The previous prime is 1098211949. The next prime is 1098211967. The reversal of 1098211957 is 7591128901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897961156 + 200250801 = 29966^2 + 14151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098211957 - 2³ = 1098211949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098211967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549105978 + 549105979.

It is an arithmetic number, because the mean of its divisors is an integer number (549105979).

Almost surely, 2^1098211957 is an apocalyptic number.

It is an amenable number.

1098211957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098211957 is an equidigital number, since it uses as much as digits as its factorization.

1098211957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 43.

The square root of 1098211957 is about 33139.2811780823. The cubic root of 1098211957 is about 1031.7204905383.

The spelling of 1098211957 in words is "one billion, ninety-eight million, two hundred eleven thousand, nine hundred fifty-seven".