1071725491 has 4 divisors (see below), whose sum is σ = 1071793800. Its totient is φ = 1071657184.

The previous prime is 1071725477. The next prime is 1071725513. The reversal of 1071725491 is 1945271701.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1071725491 is a prime.

It is a super-2 number, since 2×1071725491² = 2297191056118382162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1071725491.

It is not an unprimeable number, because it can be changed into a prime (1071725591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2475 + ... + 46363.

It is an arithmetic number, because the mean of its divisors is an integer number (267948450).

Almost surely, 2^1071725491 is an apocalyptic number.

1071725491 is a deficient number, since it is larger than the sum of its proper divisors (68309).

1071725491 is an equidigital number, since it uses as much as digits as its factorization.

1071725491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68308.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1071725491 is about 32737.2187425872. The cubic root of 1071725491 is about 1023.3586233628.

The spelling of 1071725491 in words is "one billion, seventy-one million, seven hundred twenty-five thousand, four hundred ninety-one".