1651215361 has 4 divisors (see below), whose sum is σ = 1651984452. Its totient is φ = 1650446272.

The previous prime is 1651215353. The next prime is 1651215373. The reversal of 1651215361 is 1635121561.

It is a happy number.

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 73616400 + 1577598961 = 8580^2 + 39719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651215361 - 2³ = 1651215353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651215301) 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, 381316 + ... + 385621.

It is an arithmetic number, because the mean of its divisors is an integer number (412996113).

Almost surely, 2^1651215361 is an apocalyptic number.

It is an amenable number.

1651215361 is a deficient number, since it is larger than the sum of its proper divisors (769091).

1651215361 is an equidigital number, since it uses as much as digits as its factorization.

1651215361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769090.

The product of its digits is 5400, while the sum is 31.

The square root of 1651215361 is about 40635.1493291215. The cubic root of 1651215361 is about 1181.9558106691.

The spelling of 1651215361 in words is "one billion, six hundred fifty-one million, two hundred fifteen thousand, three hundred sixty-one".