155121742 has 8 divisors (see below), whose sum is σ = 232792056. Its totient is φ = 77524392.

The previous prime is 155121727. The next prime is 155121751. The reversal of 155121742 is 247121551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×155121742² = 48125509682229128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155121742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12573 + ... + 21640.

It is an arithmetic number, because the mean of its divisors is an integer number (29099007).

Almost surely, 2^155121742 is an apocalyptic number.

155121742 is a deficient number, since it is larger than the sum of its proper divisors (77670314).

155121742 is a wasteful number, since it uses less digits than its factorization.

155121742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36482.

The product of its digits is 2800, while the sum is 28.

The square root of 155121742 is about 12454.7879146937. The cubic root of 155121742 is about 537.3091351890.

The spelling of 155121742 in words is "one hundred fifty-five million, one hundred twenty-one thousand, seven hundred forty-two".