263621042 has 4 divisors (see below), whose sum is σ = 395431566. Its totient is φ = 131810520.

The previous prime is 263620957. The next prime is 263621051. The reversal of 263621042 is 240126362.

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., 201668401 + 61952641 = 14201^2 + 7871^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65905259 + ... + 65905262.

Almost surely, 2^263621042 is an apocalyptic number.

263621042 is a deficient number, since it is larger than the sum of its proper divisors (131810524).

263621042 is a wasteful number, since it uses less digits than its factorization.

263621042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131810523.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 263621042 is about 16236.4109950444. The cubic root of 263621042 is about 641.1997693163.

The spelling of 263621042 in words is "two hundred sixty-three million, six hundred twenty-one thousand, forty-two".