1651530761 has 4 divisors (see below), whose sum is σ = 1652068500. Its totient is φ = 1650993024.

The previous prime is 1651530703. The next prime is 1651530767. The reversal of 1651530761 is 1670351561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1670351561 = 1487 ⋅1123303.

It can be written as a sum of positive squares in 2 ways, for example, as 663371536 + 988159225 = 25756^2 + 31435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651530761 - 2²⁶ = 1584421897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651530767) 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, 264236 + ... + 270413.

It is an arithmetic number, because the mean of its divisors is an integer number (413017125).

Almost surely, 2^1651530761 is an apocalyptic number.

It is an amenable number.

1651530761 is a deficient number, since it is larger than the sum of its proper divisors (537739).

1651530761 is an equidigital number, since it uses as much as digits as its factorization.

1651530761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537738.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1651530761 is about 40639.0300204126. The cubic root of 1651530761 is about 1182.0310613276.

The spelling of 1651530761 in words is "one billion, six hundred fifty-one million, five hundred thirty thousand, seven hundred sixty-one".