157219709 has 2 divisors, whose sum is σ = 157219710. Its totient is φ = 157219708.

The previous prime is 157219691. The next prime is 157219819. The reversal of 157219709 is 907912751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142802500 + 14417209 = 11950^2 + 3797^2 .

It is an emirp because it is prime and its reverse (907912751) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157219709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157219409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78609854 + 78609855.

It is an arithmetic number, because the mean of its divisors is an integer number (78609855).

Almost surely, 2^157219709 is an apocalyptic number.

It is an amenable number.

157219709 is a deficient number, since it is larger than the sum of its proper divisors (1).

157219709 is an equidigital number, since it uses as much as digits as its factorization.

157219709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 157219709 is about 12538.7283645512. The cubic root of 157219709 is about 539.7206019196.

The spelling of 157219709 in words is "one hundred fifty-seven million, two hundred nineteen thousand, seven hundred nine".