1245644131 has 4 divisors (see below), whose sum is σ = 1245732264. Its totient is φ = 1245556000.

The previous prime is 1245644129. The next prime is 1245644137. The reversal of 1245644131 is 1314465421.

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.

It is a cyclic number.

It is not a de Polignac number, because 1245644131 - 2¹ = 1245644129 is a prime.

It is a super-3 number, since 3×1245644131³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1245644093 and 1245644102.

It is not an unprimeable number, because it can be changed into a prime (1245644137) 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, 17545 + ... + 52906.

It is an arithmetic number, because the mean of its divisors is an integer number (311433066).

Almost surely, 2^1245644131 is an apocalyptic number.

1245644131 is a deficient number, since it is larger than the sum of its proper divisors (88133).

1245644131 is an equidigital number, since it uses as much as digits as its factorization.

1245644131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88132.

The product of its digits is 11520, while the sum is 31.

The square root of 1245644131 is about 35293.6840100322. The cubic root of 1245644131 is about 1075.9646307409.

The spelling of 1245644131 in words is "one billion, two hundred forty-five million, six hundred forty-four thousand, one hundred thirty-one".