1631261253 has 4 divisors (see below), whose sum is σ = 2175015008. Its totient is φ = 1087507500.

The previous prime is 1631261239. The next prime is 1631261263. The reversal of 1631261253 is 3521621361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3521621361 = 3 ⋅1173873787.

It is not a de Polignac number, because 1631261253 - 2⁴ = 1631261237 is a prime.

It is a super-2 number, since 2×1631261253² = 5322026551078260018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1631261253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631261213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271876873 + ... + 271876878.

It is an arithmetic number, because the mean of its divisors is an integer number (543753752).

Almost surely, 2^1631261253 is an apocalyptic number.

It is an amenable number.

1631261253 is a deficient number, since it is larger than the sum of its proper divisors (543753755).

1631261253 is an equidigital number, since it uses as much as digits as its factorization.

1631261253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543753754.

The product of its digits is 6480, while the sum is 30.

The square root of 1631261253 is about 40388.8753619112. The cubic root of 1631261253 is about 1177.1753882718.

The spelling of 1631261253 in words is "one billion, six hundred thirty-one million, two hundred sixty-one thousand, two hundred fifty-three".