1623553261 has 16 divisors (see below), whose sum is σ = 1879701120. Its totient is φ = 1385902080.

The previous prime is 1623553213. The next prime is 1623553271.

1623553261 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1623553261 - 2¹³ = 1623545069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623553201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72205 + ... + 91981.

It is an arithmetic number, because the mean of its divisors is an integer number (117481320).

Almost surely, 2^1623553261 is an apocalyptic number.

1623553261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1623553261 is a deficient number, since it is larger than the sum of its proper divisors (256147859).

1623553261 is a wasteful number, since it uses less digits than its factorization.

1623553261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20244.

The product of its digits is 32400, while the sum is 34.

The square root of 1623553261 is about 40293.3401569043. The cubic root of 1623553261 is about 1175.3183410269.

It can be divided in two parts, 16235 and 53261, that added together give a palindrome (69496).

The spelling of 1623553261 in words is "one billion, six hundred twenty-three million, five hundred fifty-three thousand, two hundred sixty-one".