1145720605 has 16 divisors (see below), whose sum is σ = 1431502128. Its totient is φ = 879552000.

The previous prime is 1145720591. The next prime is 1145720617. The reversal of 1145720605 is 5060275411.

It can be written as a sum of positive squares in 8 ways, for example, as 327646201 + 818074404 = 18101^2 + 28602^2 .

It is not a de Polignac number, because 1145720605 - 2⁵ = 1145720573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33306 + ... + 58315.

It is an arithmetic number, because the mean of its divisors is an integer number (89468883).

Almost surely, 2^1145720605 is an apocalyptic number.

It is an amenable number.

1145720605 is a deficient number, since it is larger than the sum of its proper divisors (285781523).

1145720605 is an equidigital number, since it uses as much as digits as its factorization.

1145720605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91728.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 1145720605 is about 33848.4948705256. The cubic root of 1145720605 is about 1046.3883791757.

The spelling of 1145720605 in words is "one billion, one hundred forty-five million, seven hundred twenty thousand, six hundred five".