1721662925 has 12 divisors (see below), whose sum is σ = 2135402016. Its totient is φ = 1376982000.

The previous prime is 1721662919. The next prime is 1721662931. The reversal of 1721662925 is 5292661271.

It is an interprime number because it is at equal distance from previous prime (1721662919) and next prime (1721662931).

It is not a de Polignac number, because 1721662925 - 2⁴ = 1721662909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146000 + ... + 157350.

It is an arithmetic number, because the mean of its divisors is an integer number (177950168).

Almost surely, 2^1721662925 is an apocalyptic number.

It is an amenable number.

1721662925 is a deficient number, since it is larger than the sum of its proper divisors (413739091).

1721662925 is a wasteful number, since it uses less digits than its factorization.

1721662925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17428 (or 17423 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 1721662925 is about 41492.9262043544. The cubic root of 1721662925 is about 1198.5312876274.

The spelling of 1721662925 in words is "one billion, seven hundred twenty-one million, six hundred sixty-two thousand, nine hundred twenty-five".