1555431061 has 8 divisors (see below), whose sum is σ = 1565222400. Its totient is φ = 1545652320.

The previous prime is 1555431047. The next prime is 1555431071. The reversal of 1555431061 is 1601345551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1555431061 - 2¹⁵ = 1555398293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555431041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398841 + ... + 402721.

It is an arithmetic number, because the mean of its divisors is an integer number (195652800).

Almost surely, 2^1555431061 is an apocalyptic number.

It is an amenable number.

1555431061 is a deficient number, since it is larger than the sum of its proper divisors (9791339).

1555431061 is a wasteful number, since it uses less digits than its factorization.

1555431061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6299.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 1555431061 is about 39438.9535992019. The cubic root of 1555431061 is about 1158.6446370142.

The spelling of 1555431061 in words is "one billion, five hundred fifty-five million, four hundred thirty-one thousand, sixty-one".