1651125849 has 4 divisors (see below), whose sum is σ = 2201501136. Its totient is φ = 1100750564.

The previous prime is 1651125793. The next prime is 1651125871. The reversal of 1651125849 is 9485211561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1651125849 - 2²⁴ = 1634348633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1651125849.

It is not an unprimeable number, because it can be changed into a prime (1651125149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275187639 + ... + 275187644.

It is an arithmetic number, because the mean of its divisors is an integer number (550375284).

Almost surely, 2^1651125849 is an apocalyptic number.

It is an amenable number.

1651125849 is a deficient number, since it is larger than the sum of its proper divisors (550375287).

1651125849 is an equidigital number, since it uses as much as digits as its factorization.

1651125849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550375286.

The product of its digits is 86400, while the sum is 42.

The square root of 1651125849 is about 40634.0479032055. The cubic root of 1651125849 is about 1181.9344524335.

The spelling of 1651125849 in words is "one billion, six hundred fifty-one million, one hundred twenty-five thousand, eight hundred forty-nine".