1631720541 has 16 divisors (see below), whose sum is σ = 2396459520. Its totient is φ = 979318320.

The previous prime is 1631720507. The next prime is 1631720543. The reversal of 1631720541 is 1450271361.

It is not a de Polignac number, because 1631720541 - 2⁹ = 1631720029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1631720499 and 1631720508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631720543) 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, 236631 + ... + 243428.

It is an arithmetic number, because the mean of its divisors is an integer number (149778720).

Almost surely, 2^1631720541 is an apocalyptic number.

1631720541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1631720541 is a deficient number, since it is larger than the sum of its proper divisors (764738979).

1631720541 is a wasteful number, since it uses less digits than its factorization.

1631720541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480176.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1631720541 is about 40394.5607848383. The cubic root of 1631720541 is about 1177.2858573530.

The spelling of 1631720541 in words is "one billion, six hundred thirty-one million, seven hundred twenty thousand, five hundred forty-one".