1553964994 has 4 divisors (see below), whose sum is σ = 2330947494. Its totient is φ = 776982496.

The previous prime is 1553964983. The next prime is 1553965043. The reversal of 1553964994 is 4994693551.

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

It can be written as a sum of positive squares in only one way, i.e., 1081554769 + 472410225 = 32887^2 + 21735^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388491247 + ... + 388491250.

Almost surely, 2^1553964994 is an apocalyptic number.

1553964994 is a deficient number, since it is larger than the sum of its proper divisors (776982500).

1553964994 is an equidigital number, since it uses as much as digits as its factorization.

1553964994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776982499.

The product of its digits is 5248800, while the sum is 55.

The square root of 1553964994 is about 39420.3626822484. The cubic root of 1553964994 is about 1158.2804968786.

The spelling of 1553964994 in words is "one billion, five hundred fifty-three million, nine hundred sixty-four thousand, nine hundred ninety-four".