1545072731 has 2 divisors, whose sum is σ = 1545072732. Its totient is φ = 1545072730.

The previous prime is 1545072703. The next prime is 1545072779. The reversal of 1545072731 is 1372705451.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1545072731 is a prime.

It is a super-2 number, since 2×1545072731² = 4774499488159596722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1545072691 and 1545072700.

It is not a weakly prime, because it can be changed into another prime (1545072131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772536365 + 772536366.

It is an arithmetic number, because the mean of its divisors is an integer number (772536366).

Almost surely, 2^1545072731 is an apocalyptic number.

1545072731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545072731 is an equidigital number, since it uses as much as digits as its factorization.

1545072731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 1545072731 is about 39307.4131812308. The cubic root of 1545072731 is about 1156.0669241536.

The spelling of 1545072731 in words is "one billion, five hundred forty-five million, seventy-two thousand, seven hundred thirty-one".