1025168749 has 6 divisors (see below), whose sum is σ = 1126838510. Its totient is φ = 931971480.

The previous prime is 1025168741. The next prime is 1025168759. The reversal of 1025168749 is 9478615201.

It can be written as a sum of positive squares in only one way, i.e., 808549225 + 216619524 = 28435^2 + 14718^2 .

It is not a de Polignac number, because 1025168749 - 2³ = 1025168741 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 (1025168741) 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, 4236114 + ... + 4236355.

Almost surely, 2^1025168749 is an apocalyptic number.

It is an amenable number.

1025168749 is a deficient number, since it is larger than the sum of its proper divisors (101669761).

1025168749 is an equidigital number, since it uses as much as digits as its factorization.

1025168749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472491 (or 8472480 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1025168749 is about 32018.2564953184. The cubic root of 1025168749 is about 1008.3201658519.

The spelling of 1025168749 in words is "one billion, twenty-five million, one hundred sixty-eight thousand, seven hundred forty-nine".