1721254947 has 16 divisors (see below), whose sum is σ = 2434303872. Its totient is φ = 1078093440.

The previous prime is 1721254919. The next prime is 1721254949. The reversal of 1721254947 is 7494521271.

It is not a de Polignac number, because 1721254947 - 2¹⁹ = 1720730659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1721254899 and 1721254908.

It is not an unprimeable number, because it can be changed into a prime (1721254949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433 + ... + 58674.

It is an arithmetic number, because the mean of its divisors is an integer number (152143992).

Almost surely, 2^1721254947 is an apocalyptic number.

1721254947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1721254947 is a deficient number, since it is larger than the sum of its proper divisors (713048925).

1721254947 is a wasteful number, since it uses less digits than its factorization.

1721254947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59698.

The product of its digits is 141120, while the sum is 42.

The square root of 1721254947 is about 41488.0096774960. The cubic root of 1721254947 is about 1198.4366091978.

The spelling of 1721254947 in words is "one billion, seven hundred twenty-one million, two hundred fifty-four thousand, nine hundred forty-seven".