1155551401 has 4 divisors (see below), whose sum is σ = 1166152900. Its totient is φ = 1144949904.

The previous prime is 1155551399. The next prime is 1155551461. The reversal of 1155551401 is 1041555511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1041555511 = 30983 ⋅33617.

It can be written as a sum of positive squares in 2 ways, for example, as 636805225 + 518746176 = 25235^2 + 22776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155551401 - 2¹ = 1155551399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155551401.

It is not an unprimeable number, because it can be changed into a prime (1155551461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5300586 + ... + 5300803.

It is an arithmetic number, because the mean of its divisors is an integer number (291538225).

Almost surely, 2^1155551401 is an apocalyptic number.

It is an amenable number.

1155551401 is a deficient number, since it is larger than the sum of its proper divisors (10601499).

1155551401 is a wasteful number, since it uses less digits than its factorization.

1155551401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601498.

The product of its (nonzero) digits is 2500, while the sum is 28.

The square root of 1155551401 is about 33993.4023157436. The cubic root of 1155551401 is about 1049.3726868188.

The spelling of 1155551401 in words is "one billion, one hundred fifty-five million, five hundred fifty-one thousand, four hundred one".