1253374657 has 4 divisors (see below), whose sum is σ = 1327102596. Its totient is φ = 1179646720.

The previous prime is 1253374651. The next prime is 1253374669. The reversal of 1253374657 is 7564733521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7564733521 = 137 ⋅55217033.

It can be written as a sum of positive squares in 2 ways, for example, as 847916161 + 405458496 = 29119^2 + 20136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253374657 - 2¹⁵ = 1253341889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253374651) 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, 36863944 + ... + 36863977.

It is an arithmetic number, because the mean of its divisors is an integer number (331775649).

Almost surely, 2^1253374657 is an apocalyptic number.

1253374657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1253374657 is a deficient number, since it is larger than the sum of its proper divisors (73727939).

1253374657 is an equidigital number, since it uses as much as digits as its factorization.

1253374657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73727938.

The product of its digits is 529200, while the sum is 43.

The square root of 1253374657 is about 35403.0317487076. The cubic root of 1253374657 is about 1078.1858710343.

The spelling of 1253374657 in words is "one billion, two hundred fifty-three million, three hundred seventy-four thousand, six hundred fifty-seven".