1630601257 has 4 divisors (see below), whose sum is σ = 1726518996. Its totient is φ = 1534683520.

The previous prime is 1630601249. The next prime is 1630601279. The reversal of 1630601257 is 7521060361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7521060361 = 29 ⋅259346909.

It can be written as a sum of positive squares in 2 ways, for example, as 979126681 + 651474576 = 31291^2 + 25524^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630601257 - 2³ = 1630601249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630601227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47958844 + ... + 47958877.

It is an arithmetic number, because the mean of its divisors is an integer number (431629749).

Almost surely, 2^1630601257 is an apocalyptic number.

1630601257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1630601257 is a deficient number, since it is larger than the sum of its proper divisors (95917739).

1630601257 is an equidigital number, since it uses as much as digits as its factorization.

1630601257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95917738.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1630601257 is about 40380.7040181322. The cubic root of 1630601257 is about 1177.0166080948.

The spelling of 1630601257 in words is "one billion, six hundred thirty million, six hundred one thousand, two hundred fifty-seven".