1156545 has 32 divisors (see below), whose sum is σ = 2217600. Its totient is φ = 568512.

The previous prime is 1156541. The next prime is 1156553. The reversal of 1156545 is 5456511.

It is a happy number.

1156545 is a `hidden beast` number, since 1 + 1 + 5 + 654 + 5 = 666.

It is not a de Polignac number, because 1156545 - 2² = 1156541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

1156545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1156541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1426 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2^1156545 is an apocalyptic number.

1156545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1156545 is a deficient number, since it is larger than the sum of its proper divisors (1061055).

1156545 is a wasteful number, since it uses less digits than its factorization.

1156545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 680 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1156545 is about 1075.4278218458. The cubic root of 1156545 is about 104.9673367790.

The spelling of 1156545 in words is "one million, one hundred fifty-six thousand, five hundred forty-five".