1672513261 has 4 divisors (see below), whose sum is σ = 1770896412. Its totient is φ = 1574130112.

The previous prime is 1672513253. The next prime is 1672513313. The reversal of 1672513261 is 1623152761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 588062500 + 1084450761 = 24250^2 + 32931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672513261 - 2³ = 1672513253 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 (1672513231) 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, 49191550 + ... + 49191583.

It is an arithmetic number, because the mean of its divisors is an integer number (442724103).

Almost surely, 2^1672513261 is an apocalyptic number.

It is an amenable number.

1672513261 is a deficient number, since it is larger than the sum of its proper divisors (98383151).

1672513261 is an equidigital number, since it uses as much as digits as its factorization.

1672513261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98383150.

The product of its digits is 15120, while the sum is 34.

The square root of 1672513261 is about 40896.3722229735. The cubic root of 1672513261 is about 1187.0158643433.

The spelling of 1672513261 in words is "one billion, six hundred seventy-two million, five hundred thirteen thousand, two hundred sixty-one".