1672559861 has 4 divisors (see below), whose sum is σ = 1911496992. Its totient is φ = 1433622732.

The previous prime is 1672559843. The next prime is 1672559879. The reversal of 1672559861 is 1689552761.

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.

It is an interprime number because it is at equal distance from previous prime (1672559843) and next prime (1672559879).

It is a cyclic number.

It is not a de Polignac number, because 1672559861 - 2¹⁸ = 1672297717 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 (1672559831) 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, 119468555 + ... + 119468568.

It is an arithmetic number, because the mean of its divisors is an integer number (477874248).

Almost surely, 2^1672559861 is an apocalyptic number.

It is an amenable number.

1672559861 is a deficient number, since it is larger than the sum of its proper divisors (238937131).

1672559861 is an equidigital number, since it uses as much as digits as its factorization.

1672559861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238937130.

The product of its digits is 907200, while the sum is 50.

The square root of 1672559861 is about 40896.9419516912. The cubic root of 1672559861 is about 1187.0268885560.

The spelling of 1672559861 in words is "one billion, six hundred seventy-two million, five hundred fifty-nine thousand, eight hundred sixty-one".