2157903247 has 2 divisors, whose sum is σ = 2157903248. Its totient is φ = 2157903246.

The previous prime is 2157903239. The next prime is 2157903269. The reversal of 2157903247 is 7423097512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2157903247 - 2³ = 2157903239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157903547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078951623 + 1078951624.

It is an arithmetic number, because the mean of its divisors is an integer number (1078951624).

Almost surely, 2^2157903247 is an apocalyptic number.

2157903247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157903247 is an equidigital number, since it uses as much as digits as its factorization.

2157903247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 2157903247 is about 46453.2372068944. The cubic root of 2157903247 is about 1292.2424084756.

The spelling of 2157903247 in words is "two billion, one hundred fifty-seven million, nine hundred three thousand, two hundred forty-seven".