1228261955401 has 4 divisors (see below), whose sum is σ = 1322743644292. Its totient is φ = 1133780266512.

The previous prime is 1228261955381. The next prime is 1228261955407. The reversal of 1228261955401 is 1045591628221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 555656939776 + 672605015625 = 745424^2 + 820125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228261955401 - 2³¹ = 1226114471753 is a prime.

It is a super-2 number, since 2×1228261955401² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228261955407) 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, 47240844426 + ... + 47240844451.

It is an arithmetic number, because the mean of its divisors is an integer number (330685911073).

Almost surely, 2^{1228261955401} is an apocalyptic number.

It is an amenable number.

1228261955401 is a deficient number, since it is larger than the sum of its proper divisors (94481688891).

1228261955401 is an equidigital number, since it uses as much as digits as its factorization.

1228261955401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94481688890.

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 1228261955401 in words is "one trillion, two hundred twenty-eight billion, two hundred sixty-one million, nine hundred fifty-five thousand, four hundred one".