1621455034 has 4 divisors (see below), whose sum is σ = 2432182554. Its totient is φ = 810727516.

The previous prime is 1621455001. The next prime is 1621455037. The reversal of 1621455034 is 4305541261.

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 only one way, i.e., 1505828025 + 115627009 = 38805^2 + 10753^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1621454987 and 1621455005.

It is not an unprimeable number, because it can be changed into a prime (1621455037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405363757 + ... + 405363760.

Almost surely, 2^1621455034 is an apocalyptic number.

1621455034 is a deficient number, since it is larger than the sum of its proper divisors (810727520).

1621455034 is an equidigital number, since it uses as much as digits as its factorization.

1621455034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810727519.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1621455034 is about 40267.2948433341. The cubic root of 1621455034 is about 1174.8118084600.

Adding to 1621455034 its reverse (4305541261), we get a palindrome (5926996295).

The spelling of 1621455034 in words is "one billion, six hundred twenty-one million, four hundred fifty-five thousand, thirty-four".