1025515791 has 12 divisors (see below), whose sum is σ = 1521336232. Its totient is φ = 665199216.

The previous prime is 1025515787. The next prime is 1025515811. The reversal of 1025515791 is 1975155201.

1025515791 is a `hidden beast` number, since 10 + 2 + 551 + 5 + 7 + 91 = 666.

It is not a de Polignac number, because 1025515791 - 2² = 1025515787 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 (1025515741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1539481 + ... + 1540146.

Almost surely, 2^1025515791 is an apocalyptic number.

1025515791 is a deficient number, since it is larger than the sum of its proper divisors (495820441).

1025515791 is a wasteful number, since it uses less digits than its factorization.

1025515791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079670 (or 3079667 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 36.

The square root of 1025515791 is about 32023.6754761223. The cubic root of 1025515791 is about 1008.4339324777.

The spelling of 1025515791 in words is "one billion, twenty-five million, five hundred fifteen thousand, seven hundred ninety-one".