1525914991 has 2 divisors, whose sum is σ = 1525914992. Its totient is φ = 1525914990.

The previous prime is 1525914989. The next prime is 1525915003. The reversal of 1525914991 is 1994195251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1525914991 - 2¹ = 1525914989 is a prime.

Together with 1525914989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1525914931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762957495 + 762957496.

It is an arithmetic number, because the mean of its divisors is an integer number (762957496).

Almost surely, 2^1525914991 is an apocalyptic number.

1525914991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525914991 is an equidigital number, since it uses as much as digits as its factorization.

1525914991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 46.

The square root of 1525914991 is about 39062.9618820693. The cubic root of 1525914991 is about 1151.2689184437.

The spelling of 1525914991 in words is "one billion, five hundred twenty-five million, nine hundred fourteen thousand, nine hundred ninety-one".