1252281631 has 4 divisors (see below), whose sum is σ = 1252359064. Its totient is φ = 1252204200.

The previous prime is 1252281629. The next prime is 1252281661. The reversal of 1252281631 is 1361822521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1361822521 = 28793 ⋅47297.

It is a cyclic number.

It is not a de Polignac number, because 1252281631 - 2¹ = 1252281629 is a prime.

It is a super-2 number, since 2×1252281631² = 3136418566680040322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1252281593 and 1252281602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252281661) 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, 4200 + ... + 50221.

It is an arithmetic number, because the mean of its divisors is an integer number (313089766).

Almost surely, 2^1252281631 is an apocalyptic number.

1252281631 is a deficient number, since it is larger than the sum of its proper divisors (77433).

1252281631 is an equidigital number, since it uses as much as digits as its factorization.

1252281631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77432.

The product of its digits is 5760, while the sum is 31.

The square root of 1252281631 is about 35387.5914834565. The cubic root of 1252281631 is about 1077.8723633049.

The spelling of 1252281631 in words is "one billion, two hundred fifty-two million, two hundred eighty-one thousand, six hundred thirty-one".