219430957 has 2 divisors, whose sum is σ = 219430958. Its totient is φ = 219430956.

The previous prime is 219430949. The next prime is 219430961. The reversal of 219430957 is 759034912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148011556 + 71419401 = 12166^2 + 8451^2 .

It is a cyclic number.

It is not a de Polignac number, because 219430957 - 2³ = 219430949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219430987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109715478 + 109715479.

It is an arithmetic number, because the mean of its divisors is an integer number (109715479).

Almost surely, 2^219430957 is an apocalyptic number.

It is an amenable number.

219430957 is a deficient number, since it is larger than the sum of its proper divisors (1).

219430957 is an equidigital number, since it uses as much as digits as its factorization.

219430957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 219430957 is about 14813.2021183808. The cubic root of 219430957 is about 603.1601386885.

The spelling of 219430957 in words is "two hundred nineteen million, four hundred thirty thousand, nine hundred fifty-seven".