1491163525 has 6 divisors (see below), whose sum is σ = 1849042802. Its totient is φ = 1192930800.

The previous prime is 1491163523. The next prime is 1491163537. The reversal of 1491163525 is 5253611941.

It can be written as a sum of positive squares in 3 ways, for example, as 472149441 + 1019014084 = 21729^2 + 31922^2 .

It is not a de Polignac number, because 1491163525 - 2¹ = 1491163523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491163523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29823246 + ... + 29823295.

Almost surely, 2^1491163525 is an apocalyptic number.

It is an amenable number.

1491163525 is a deficient number, since it is larger than the sum of its proper divisors (357879277).

1491163525 is an equidigital number, since it uses as much as digits as its factorization.

1491163525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59646551 (or 59646546 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 1491163525 is about 38615.5865551723. The cubic root of 1491163525 is about 1142.4619832310.

The spelling of 1491163525 in words is "one billion, four hundred ninety-one million, one hundred sixty-three thousand, five hundred twenty-five".