145117642 has 4 divisors (see below), whose sum is σ = 217676466. Its totient is φ = 72558820.

The previous prime is 145117619. The next prime is 145117697. The reversal of 145117642 is 246711541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246711541 = 4373 ⋅56417.

It can be written as a sum of positive squares in only one way, i.e., 126360081 + 18757561 = 11241^2 + 4331^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36279409 + ... + 36279412.

Almost surely, 2^145117642 is an apocalyptic number.

145117642 is a deficient number, since it is larger than the sum of its proper divisors (72558824).

145117642 is an equidigital number, since it uses as much as digits as its factorization.

145117642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72558823.

The product of its digits is 6720, while the sum is 31.

The square root of 145117642 is about 12046.4784065718. The cubic root of 145117642 is about 525.5008275977.

The spelling of 145117642 in words is "one hundred forty-five million, one hundred seventeen thousand, six hundred forty-two".