1651248191 has 4 divisors (see below), whose sum is σ = 1661378712. Its totient is φ = 1641117672.

The previous prime is 1651248187. The next prime is 1651248211. The reversal of 1651248191 is 1918421561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1651248191 - 2² = 1651248187 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 (1651248121) 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, 5065016 + ... + 5065341.

It is an arithmetic number, because the mean of its divisors is an integer number (415344678).

Almost surely, 2^1651248191 is an apocalyptic number.

1651248191 is a deficient number, since it is larger than the sum of its proper divisors (10130521).

1651248191 is a wasteful number, since it uses less digits than its factorization.

1651248191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10130520.

The product of its digits is 17280, while the sum is 38.

The square root of 1651248191 is about 40635.5532877307. The cubic root of 1651248191 is about 1181.9636439603.

The spelling of 1651248191 in words is "one billion, six hundred fifty-one million, two hundred forty-eight thousand, one hundred ninety-one".