1553394901 has 4 divisors (see below), whose sum is σ = 1554849100. Its totient is φ = 1551940704.

The previous prime is 1553394859. The next prime is 1553394919. The reversal of 1553394901 is 1094933551.

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 896703025 + 656691876 = 29945^2 + 25626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1553394901 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 (1553394961) 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, 725496 + ... + 727633.

It is an arithmetic number, because the mean of its divisors is an integer number (388712275).

Almost surely, 2^1553394901 is an apocalyptic number.

It is an amenable number.

1553394901 is a deficient number, since it is larger than the sum of its proper divisors (1454199).

1553394901 is a wasteful number, since it uses less digits than its factorization.

1553394901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454198.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 1553394901 is about 39413.1310732857. The cubic root of 1553394901 is about 1158.1388359505.

The spelling of 1553394901 in words is "one billion, five hundred fifty-three million, three hundred ninety-four thousand, nine hundred one".