901648450821 has 4 divisors (see below), whose sum is σ = 1202197934432. Its totient is φ = 601098967212.

The previous prime is 901648450819. The next prime is 901648450823. The reversal of 901648450821 is 128054846109.

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, and also an emirpimes, since its reverse is a distinct semiprime: 128054846109 = 3 ⋅42684948703.

It is an interprime number because it is at equal distance from previous prime (901648450819) and next prime (901648450823).

It is not a de Polignac number, because 901648450821 - 2¹ = 901648450819 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 (901648450823) 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, 150274741801 + ... + 150274741806.

It is an arithmetic number, because the mean of its divisors is an integer number (300549483608).

Almost surely, 2^901648450821 is an apocalyptic number.

It is an amenable number.

901648450821 is a deficient number, since it is larger than the sum of its proper divisors (300549483611).

901648450821 is a wasteful number, since it uses less digits than its factorization.

901648450821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300549483610.

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 901648450821 in words is "nine hundred one billion, six hundred forty-eight million, four hundred fifty thousand, eight hundred twenty-one".