1201550401 has 4 divisors (see below), whose sum is σ = 1212779952. Its totient is φ = 1190320852.

The previous prime is 1201550393. The next prime is 1201550411. The reversal of 1201550401 is 1040551021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201550401 - 2³ = 1201550393 is a prime.

It is a super-2 number, since 2×1201550401² = 2887446732286521602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201550411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5614615 + ... + 5614828.

It is an arithmetic number, because the mean of its divisors is an integer number (303194988).

Almost surely, 2^1201550401 is an apocalyptic number.

It is an amenable number.

1201550401 is a deficient number, since it is larger than the sum of its proper divisors (11229551).

1201550401 is a wasteful number, since it uses less digits than its factorization.

1201550401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11229550.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1201550401 is about 34663.3870387762. The cubic root of 1201550401 is about 1063.1160241474.

The spelling of 1201550401 in words is "one billion, two hundred one million, five hundred fifty thousand, four hundred one".