1253563634 has 4 divisors (see below), whose sum is σ = 1880345454. Its totient is φ = 626781816.

The previous prime is 1253563631. The next prime is 1253563637. The reversal of 1253563634 is 4363653521.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1253563631) and next prime (1253563637).

It can be written as a sum of positive squares in only one way, i.e., 1214313409 + 39250225 = 34847^2 + 6265^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1253563631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313390907 + ... + 313390910.

Almost surely, 2^1253563634 is an apocalyptic number.

1253563634 is a deficient number, since it is larger than the sum of its proper divisors (626781820).

1253563634 is an equidigital number, since it uses as much as digits as its factorization.

1253563634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626781819.

The product of its digits is 194400, while the sum is 38.

The square root of 1253563634 is about 35405.7005862050. The cubic root of 1253563634 is about 1078.2400559744.

The spelling of 1253563634 in words is "one billion, two hundred fifty-three million, five hundred sixty-three thousand, six hundred thirty-four".