155354993 has 6 divisors (see below), whose sum is σ = 164547954. Its totient is φ = 146168096.

The previous prime is 155354989. The next prime is 155355017. The reversal of 155354993 is 399453551.

It can be written as a sum of positive squares in only one way, i.e., 146216464 + 9138529 = 12092^2 + 3023^2 .

It is not a de Polignac number, because 155354993 - 2² = 155354989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155354593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49880 + ... + 52902.

It is an arithmetic number, because the mean of its divisors is an integer number (27424659).

Almost surely, 2^155354993 is an apocalyptic number.

It is an amenable number.

155354993 is a deficient number, since it is larger than the sum of its proper divisors (9192961).

155354993 is an frugal number, since it uses more digits than its factorization.

155354993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6063 (or 3040 counting only the distinct ones).

The product of its digits is 364500, while the sum is 44.

The square root of 155354993 is about 12464.1483062422. The cubic root of 155354993 is about 537.5783111426.

The spelling of 155354993 in words is "one hundred fifty-five million, three hundred fifty-four thousand, nine hundred ninety-three".