1025148991 has 2 divisors, whose sum is σ = 1025148992. Its totient is φ = 1025148990.

The previous prime is 1025148983. The next prime is 1025148997. The reversal of 1025148991 is 1998415201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1025148991 - 2³ = 1025148983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025148997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512574495 + 512574496.

It is an arithmetic number, because the mean of its divisors is an integer number (512574496).

Almost surely, 2^1025148991 is an apocalyptic number.

1025148991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025148991 is an equidigital number, since it uses as much as digits as its factorization.

1025148991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1025148991 is about 32017.9479511102. The cubic root of 1025148991 is about 1008.3136880508.

The spelling of 1025148991 in words is "one billion, twenty-five million, one hundred forty-eight thousand, nine hundred ninety-one".