1245156641 has 8 divisors (see below), whose sum is σ = 1255762944. Its totient is φ = 1234563120.

The previous prime is 1245156637. The next prime is 1245156667. The reversal of 1245156641 is 1466515421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1245156641 - 2² = 1245156637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245156691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387146 + ... + 390348.

It is an arithmetic number, because the mean of its divisors is an integer number (156970368).

Almost surely, 2^1245156641 is an apocalyptic number.

It is an amenable number.

1245156641 is a deficient number, since it is larger than the sum of its proper divisors (10606303).

1245156641 is a wasteful number, since it uses less digits than its factorization.

1245156641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391.

The product of its digits is 28800, while the sum is 35.

The square root of 1245156641 is about 35286.7771410198. Note that the first 3 decimals coincide. The cubic root of 1245156641 is about 1075.8242507761.

The spelling of 1245156641 in words is "one billion, two hundred forty-five million, one hundred fifty-six thousand, six hundred forty-one".