1554121545 has 16 divisors (see below), whose sum is σ = 2553800640. Its totient is φ = 806462784.

The previous prime is 1554121531. The next prime is 1554121559. The reversal of 1554121545 is 5451214551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1554121531) and next prime (1554121559).

It is not a de Polignac number, because 1554121545 - 2¹⁵ = 1554088777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1399555 + ... + 1400664.

It is an arithmetic number, because the mean of its divisors is an integer number (159612540).

Almost surely, 2^1554121545 is an apocalyptic number.

1554121545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1554121545 is a deficient number, since it is larger than the sum of its proper divisors (999679095).

1554121545 is a wasteful number, since it uses less digits than its factorization.

1554121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800264.

The product of its digits is 20000, while the sum is 33.

The square root of 1554121545 is about 39422.3482938295. The cubic root of 1554121545 is about 1158.3193917661.

The spelling of 1554121545 in words is "one billion, five hundred fifty-four million, one hundred twenty-one thousand, five hundred forty-five".