155614421 has 2 divisors, whose sum is σ = 155614422. Its totient is φ = 155614420.

The previous prime is 155614411. The next prime is 155614429. The reversal of 155614421 is 124416551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116100625 + 39513796 = 10775^2 + 6286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155614421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155614429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77807210 + 77807211.

It is an arithmetic number, because the mean of its divisors is an integer number (77807211).

Almost surely, 2^155614421 is an apocalyptic number.

It is an amenable number.

155614421 is a deficient number, since it is larger than the sum of its proper divisors (1).

155614421 is an equidigital number, since it uses as much as digits as its factorization.

155614421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 155614421 is about 12474.5509338012. The cubic root of 155614421 is about 537.8773795439.

The spelling of 155614421 in words is "one hundred fifty-five million, six hundred fourteen thousand, four hundred twenty-one".