1651532651 has 4 divisors (see below), whose sum is σ = 1651759032. Its totient is φ = 1651306272.

The previous prime is 1651532627. The next prime is 1651532653. The reversal of 1651532651 is 1562351561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1562351561 = 17 ⋅91903033.

It is a cyclic number.

It is not a de Polignac number, because 1651532651 - 2¹⁸ = 1651270507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651532653) 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, 101870 + ... + 116963.

It is an arithmetic number, because the mean of its divisors is an integer number (412939758).

Almost surely, 2^1651532651 is an apocalyptic number.

1651532651 is a deficient number, since it is larger than the sum of its proper divisors (226381).

1651532651 is an equidigital number, since it uses as much as digits as its factorization.

1651532651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226380.

The product of its digits is 27000, while the sum is 35.

The square root of 1651532651 is about 40639.0532739138. The cubic root of 1651532651 is about 1182.0315122301.

The spelling of 1651532651 in words is "one billion, six hundred fifty-one million, five hundred thirty-two thousand, six hundred fifty-one".