1621261434 has 32 divisors (see below), whose sum is σ = 3493707840. Its totient is φ = 498598272.

The previous prime is 1621261417. The next prime is 1621261441. The reversal of 1621261434 is 4341621261.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203494 + ... + 211310.

It is an arithmetic number, because the mean of its divisors is an integer number (109178370).

Almost surely, 2^1621261434 is an apocalyptic number.

1621261434 is an abundant number, since it is smaller than the sum of its proper divisors (1872446406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621261434 is a wasteful number, since it uses less digits than its factorization.

1621261434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10494.

The product of its digits is 6912, while the sum is 30.

The square root of 1621261434 is about 40264.8908355654. The cubic root of 1621261434 is about 1174.7650495070.

Adding to 1621261434 its reverse (4341621261), we get a palindrome (5962882695).

The spelling of 1621261434 in words is "one billion, six hundred twenty-one million, two hundred sixty-one thousand, four hundred thirty-four".