2157207499 has 2 divisors, whose sum is σ = 2157207500. Its totient is φ = 2157207498.

The previous prime is 2157207463. The next prime is 2157207511. The reversal of 2157207499 is 9947027512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157207499 - 2¹⁹ = 2156683211 is a prime.

It is not a weakly prime, because it can be changed into another prime (2157207449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078603749 + 1078603750.

It is an arithmetic number, because the mean of its divisors is an integer number (1078603750).

Almost surely, 2^2157207499 is an apocalyptic number.

2157207499 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157207499 is an equidigital number, since it uses as much as digits as its factorization.

2157207499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 2157207499 is about 46445.7479108691. The cubic root of 2157207499 is about 1292.1035125796.

The spelling of 2157207499 in words is "two billion, one hundred fifty-seven million, two hundred seven thousand, four hundred ninety-nine".