1145720641 has 8 divisors (see below), whose sum is σ = 1246574504. Its totient is φ = 1046684160.

The previous prime is 1145720621. The next prime is 1145720659. The reversal of 1145720641 is 1460275411.

It can be written as a sum of positive squares in 4 ways, for example, as 129960000 + 1015760641 = 11400^2 + 31871^2 .

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 1145720641 - 2²³ = 1137332033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145720621) 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, 453030 + ... + 455551.

It is an arithmetic number, because the mean of its divisors is an integer number (155821813).

Almost surely, 2^1145720641 is an apocalyptic number.

It is an amenable number.

1145720641 is a deficient number, since it is larger than the sum of its proper divisors (100853863).

1145720641 is an equidigital number, since it uses as much as digits as its factorization.

1145720641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908691.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1145720641 is about 33848.4954023070. The cubic root of 1145720641 is about 1046.3883901353.

The spelling of 1145720641 in words is "one billion, one hundred forty-five million, seven hundred twenty thousand, six hundred forty-one".