123451553 has 2 divisors, whose sum is σ = 123451554. Its totient is φ = 123451552.

The previous prime is 123451487. The next prime is 123451583. The reversal of 123451553 is 355154321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122921569 + 529984 = 11087^2 + 728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123451553 is a prime.

It is a super-2 number, since 2×123451553² = 30480571876223618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123451583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61725776 + 61725777.

It is an arithmetic number, because the mean of its divisors is an integer number (61725777).

Almost surely, 2^123451553 is an apocalyptic number.

It is an amenable number.

123451553 is a deficient number, since it is larger than the sum of its proper divisors (1).

123451553 is an equidigital number, since it uses as much as digits as its factorization.

123451553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 29.

The square root of 123451553 is about 11110.8754380562. The cubic root of 123451553 is about 497.9268197280.

The spelling of 123451553 in words is "one hundred twenty-three million, four hundred fifty-one thousand, five hundred fifty-three".