1651957349 has 4 divisors (see below), whose sum is σ = 1887951264. Its totient is φ = 1415963436.

The previous prime is 1651957339. The next prime is 1651957393. The reversal of 1651957349 is 9437591561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9437591561 = 59 ⋅159959179.

It is a cyclic number.

It is not a de Polignac number, because 1651957349 - 2²⁴ = 1635180133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1651957297 and 1651957306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651957339) 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, 117996947 + ... + 117996960.

It is an arithmetic number, because the mean of its divisors is an integer number (471987816).

Almost surely, 2^1651957349 is an apocalyptic number.

It is an amenable number.

1651957349 is a deficient number, since it is larger than the sum of its proper divisors (235993915).

1651957349 is an equidigital number, since it uses as much as digits as its factorization.

1651957349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235993914.

The product of its digits is 1020600, while the sum is 50.

The square root of 1651957349 is about 40644.2781827898. The cubic root of 1651957349 is about 1182.1328248692.

The spelling of 1651957349 in words is "one billion, six hundred fifty-one million, nine hundred fifty-seven thousand, three hundred forty-nine".