1653641434 has 4 divisors (see below), whose sum is σ = 2480462154. Its totient is φ = 826820716.

The previous prime is 1653641399. The next prime is 1653641447. The reversal of 1653641434 is 4341463561.

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

It can be written as a sum of positive squares in only one way, i.e., 1650390625 + 3250809 = 40625^2 + 1803^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1653641393 and 1653641402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413410357 + ... + 413410360.

Almost surely, 2^1653641434 is an apocalyptic number.

1653641434 is a deficient number, since it is larger than the sum of its proper divisors (826820720).

1653641434 is an equidigital number, since it uses as much as digits as its factorization.

1653641434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826820719.

The product of its digits is 103680, while the sum is 37.

The square root of 1653641434 is about 40664.9902741904. The cubic root of 1653641434 is about 1182.5343961794.

It can be divided in two parts, 16536 and 41434, that added together give a triangular number (57970 = T₃₄₀).

The spelling of 1653641434 in words is "one billion, six hundred fifty-three million, six hundred forty-one thousand, four hundred thirty-four".