155071493 has 4 divisors (see below), whose sum is σ = 155266860. Its totient is φ = 154876128.

The previous prime is 155071489. The next prime is 155071507. The reversal of 155071493 is 394170551.

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 114532804 + 40538689 = 10702^2 + 6367^2 .

It is a cyclic number.

It is not a de Polignac number, because 155071493 - 2² = 155071489 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 (155071463) 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, 96488 + ... + 98081.

It is an arithmetic number, because the mean of its divisors is an integer number (38816715).

Almost surely, 2^155071493 is an apocalyptic number.

It is an amenable number.

155071493 is a deficient number, since it is larger than the sum of its proper divisors (195367).

155071493 is an equidigital number, since it uses as much as digits as its factorization.

155071493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195366.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 155071493 is about 12452.7704949541. The cubic root of 155071493 is about 537.2511115958.

The spelling of 155071493 in words is "one hundred fifty-five million, seventy-one thousand, four hundred ninety-three".