1201863631 has 4 divisors (see below), whose sum is σ = 1229813992. Its totient is φ = 1173913272.

The previous prime is 1201863589. The next prime is 1201863653. The reversal of 1201863631 is 1363681021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201863631 - 2⁷ = 1201863503 is a prime.

It is a super-2 number, since 2×1201863631² = 2888952375041008322, 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 = 1201863593 and 1201863602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201860631) 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, 13975116 + ... + 13975201.

It is an arithmetic number, because the mean of its divisors is an integer number (307453498).

Almost surely, 2^1201863631 is an apocalyptic number.

1201863631 is a deficient number, since it is larger than the sum of its proper divisors (27950361).

1201863631 is an equidigital number, since it uses as much as digits as its factorization.

1201863631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27950360.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1201863631 is about 34667.9049121807. The cubic root of 1201863631 is about 1063.2083967186.

The spelling of 1201863631 in words is "one billion, two hundred one million, eight hundred sixty-three thousand, six hundred thirty-one".